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Two private citizens are reported to have paid large deposits to fly around the moon in 2018

Plants from semi-tropical climes are overtaking native British species and choking habitat as they flourish in warmer conditions

A half-degree increase in the average temperature in September and October in East Anglia this century has made an already troublesome plant invader even more of a nuisance. While the change in climate has been hardly noticeable to humans, it has made an enormous difference to the floating pennywort, Hydrocotyle ranunculoide, which already threatens to choke slow-moving rivers and the Broads.

The extension of warmer weather into autumn has give this semi-tropical South American plant the opportunity to produce viable seeds for the first time enabling it to spread even faster.

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Member states approve changes, including €12bn innovation fund, to emissions plan for cleaner technology and pollution cuts

An overhaul of the EU’s flagship trading scheme for cutting carbon emissions by European industries has been approved by the member states.

The agreement to reform the emissions trading system comes after almost two years’ of discussions but just two weeks after the European parliament voted in favour of a new directive.

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Farmers face falling crop yields and growing food demand. Shutterstock

Climate change and extreme weather events are already having impacts on our food, from meat and vegetables, right through to wine. In our series on the Climate and Food, we’re looking at what this means for the food chain.

While increases in population and wealth will lift global demand for food by up to 70% by 2050, agriculture is already feeling the effects of climate change. This is expected to continue in coming decades.

Scientists and farmers will need to act on multiple fronts to counter falling crop yields and feed more people. As with previous agricultural revolutions, we need a new set of plant characteristics to meet the challenge.

When it comes to the staple crops – wheat, rice, maize, soybean, barley and sorghum – research has found changes in rainfall and temperature explain about 30% of the yearly variation in agricultural yields. All six crops responded negatively to increasing temperatures – most likely associated with increases in crop development rates and water stress. In particular, wheat, maize and barley show a negative response to increased temperatures. But, overall, rainfall trends had only minor effects on crop yields in these studies.

Since 1950, average global temperatures have risen by roughly 0.13°C per decade. An even faster rate of roughly 0.2°C of warming per decade is expected over the next few decades.

As temperatures rise, rainfall patterns change. Increased heat also leads to greater evaporation and surface drying, which further intensifies and prolongs droughts.

A warmer atmosphere can also hold more water – about 7% more water vapour for every 1°C increase in temperature. This ultimately results in storms with more intense rainfall. A review of rainfall patterns shows changes in the amount of rainfall everywhere.

Maize yields are predicted to decline with climate change. Shutterstock Falling yields

Crop yields around Australia have been hard hit by recent weather. Last year, for instance, the outlook for mungbeans was excellent. But the hot, dry weather has hurt growers. The extreme conditions have reduced average yields from an expected 1-1.5 tonnes per hectare to just 0.1-0.5 tonnes per hectare.

Sorghum and cotton crops fared little better, due to depleted soil water, lack of in-crop rainfall, and extreme heat. Fruit and vegetables, from strawberries to lettuce, were also hit hard.

But the story is larger than this. Globally, production of maize and wheat between 1980 and 2008 was 3.8% and 5.5% below what we would have expected without temperature increases. One model, which combines historical crop production and weather data, projects significant reductions in production of several key African crops. For maize, the predicted decline is as much as 22% by 2050.

Feeding more people in these changing conditions is the challenge before us. It will require crops that are highly adapted to dry and hot environments. The so-called “Green Revolution” of the 1960s and 1970s created plants with short stature and enhanced responsiveness to nitrogen fertilizer.

Now, a new set of plant characteristics is needed to further increase crop yield, by making plants resilient to the challenges of a water-scarce planet.

Developing resilient crops for a highly variable climate

Resilient crops will require significant research and action on multiple fronts – to create adaptation to drought and waterlogging, and tolerance to cold, heat and salinity. Whatever we do, we also need to factor in that agriculture contributes significantly to greenhouse gas emissions (GHGs).

Scientists are meeting this challenge by creating a framework for adapting to climate change. We are identifying favourable combinations of crop varieties (genotypes) and management practices (agronomy) to work together in a complex system.

We can mitigate the effects of some climate variations with good management practices. For example, to tackle drought, we can alter planting dates, fertilizer, irrigation, row spacing, population and cropping systems.

Genotypic solutions can bolster this approach. The challenge is to identify favourable combinations of genotypes (G) and management (M) practices in a variable environment (E). Understanding the interaction between genotypes, management and the environment (GxMxE) is critical to improving grain yield under hot and dry conditions.

Genetic and management solutions can be used to develop climate-resilient crops for highly variable environments in Australia and globally. Sorghum is a great example. It is the dietary staple for over 500 million people in more than 30 countries, making it the world’s fifth-most-important crop for human consumption after rice, wheat, maize and potatoes.

‘Stay-green’ in sorghum is an example of a genetic solution to drought that has been deployed in Australia, India and sub-Saharan Africa. Crops with stay-green maintain greener stems and leaves during drought, resulting in increased stem strength, grain size and yield. This genetic solution can be combined with a management solution (e.g. reduced plant population) to optimise production and food security in highly variable and water-limited environments.

Other projects in India have found that alternate wetting and drying (AWD) irrigation in rice, compared with normal flooded production, can reduce water use by about 32%. And, by maintaining an aerobic environment in the soil, it reduces methane emissions five-fold.

Climate change, water, agriculture and food security form a critical nexus for the 21st century. We need to create and implement practices that will increase yields, while overcoming changing conditions and limiting the emissions from the agricultural sector. There is no room for complacency here.

Andrew Borrell receives funding from the Australian Centre for International Agricultural Research, the Bill and Melinda Gates Foundation, and is an associate investigator with the ARC Centre of Excellence for Translational Photosynthesis.

Of course the unacceptable levels of air pollution in our cities is an issue that central and local government must urgently tackle (Report, 25 February). However, the elephant in the room is that millions of city dwellers routinely make unnecessary car journeys and they need to accept their responsibility and switch to alternative means of transport. Ironically, those children at London schools and nurseries you highlight are often being poisoned by their own parents’ vehicles and those of their classmates’ parents on the school run. I walk my children the mile to their school, while most of their friends are driven through the traffic-choked streets. It takes about the same time, but those families have contributed to the toxicity of the air and have done no exercise.
Adam Manolson
London

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I am completely appalled to read that an organisation that is supposed to promote wildlife and nature in this country should be recruiting volunteers to kill the UK’s grey squirrels in the north (Thousands of volunteers wanted to save red squirrel, 24 February).

This diminishes the ethos of the Wildlife Trusts. I do not believe that the culling process can ever be made humane and the idea of bludgeoning squirrels to death is barbaric. In addition I fear that the cull will need to be extended to all of the UK’s regions to prevent replenishment of culled areas by southern squirrels. The enhanced transmissibility of the squirrel pox virus among red squirrels suggests the solution should be to work to increase their resistance to this disease, rather than trying to eliminate it in its entirety by culling grey squirrels in case they harbour it.

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Exclusive: Plan also targets local air and noise pollution but critics say long-term solutions to environmental challenges are no closer to reality

The huge growth in flights from Heathrow’s planned new runway could be carbon neutral, according to an ambition revealed by the airport.

The 260,000 extra flights a year anticipated from the third runway would make the airport the UK’s largest source of carbon emissions. But Heathrow’s new sustainability plan suggests other ways to offset the leap in emissions, including by restoring British peat bogs.

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A British Museum expert says the Leekfrith Iron Age Torcs are of international importance.

The growing population of echidnas at Mulligans Flat Woodlands Sanctuary has forced researchers to consider ways of regulating the population.

Spraybot can fit under floorboards to help insulate homes.

Critics say public information film shows Shell ‘understood the threat was dire, potentially existential for civilisation, more than a quarter of a century ago’

• ‘Shell knew’: oil giant’s 1991 film warned of climate change danger

Climate change “at a rate faster than at any time since the end of the ice age – change too fast perhaps for life to adapt, without severe dislocation”. That was the startling warning issued by the oil giant Shell more than a quarter of a century ago.

The company’s farsighted 1991 film, titled Climate of Concern, set out with crystal clarity how the world was warming and that serious consequences could well result.

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Public information film unseen for years shows Shell had clear grasp of global warming 26 years ago but has not acted accordingly since, say critics

• Film warned of climate change ‘at rate faster than at any time since end of the ice age’

The oil giant Shell issued a stark warning of the catastrophic risks of climate change more than a quarter of century ago in a prescient 1991 film that has been rediscovered.

However, since then the company has invested heavily in highly polluting oil reserves and helped lobby against climate action, leading to accusations that Shell knew the grave risks of global warming but did not act accordingly.

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In 1991, Shell produced a public documentary on global warming called Climate of Concern. It warned that trends in global temperatures raised serious risks of famines, floods and climate refugees. But in the quarter century since, Shell has continued to invest heavily in fossil fuels
• Shell’s 1991 warning: climate changing ‘at faster rate than at any time since end of ice age’

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Blanchland Moor, Northumberland Strutting and posturing, the grouse makes it clear that this is his territory

On shallow puddles, delicate fans of ice dissolve under the morning sun as we follow the sandy track over Blanchland Moor. These heather uplands, now every tone of brown from straw to sepia, fill the eye with purple every August.

Stopping on a south-facing bank, we share a flask of tea, a stand of thorn trees at our backs for shelter. Nearby is the outlying farmstead of Pennypie House. The name is said to derive from cattle drovers stopping at the farm to buy a pie for a penny, but it may also be a corruption of “penny pay”, a toll asked of travellers on the ancient track. Though it’s only about four miles across, different areas of the moor have colourful names denoting ownership: Burntshieldhaugh Fell, Cowbyers Fell, Bulbeck Common and Birkside Fell.

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Environmental groups have launched a legal challenge to the government's rule change.

Bloomberg chart shows tide turning on the uptake of electric cars, as more EV models fall to around $US20,000 mark.

A group of Australians have joined a list of so-called "eminent scientists" telling president Trump that climate science is baloney.

Infigen Energy secures PPA with EnergyAustralia to buy 60% of output of proposed 113MW Bodangora wind farm in NSW to 2030.

The new Victorian feed-in tariff announced today marks an important turning point in the struggle for recognition of the real value of distributed renewable energy.

Large scale battery storage developers have expressed their frustration with Australia's knowledge gap, saying regulators and ministers appear completely unaware the technology is being deployed at scale elsewhere in the world.