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Park rangers reassess how to manage tourist violations, staff burnout and ‘animal jam’ as number of national park guests peaked to four million last year

Yellowstone national park is finding new ways to manage tourism after visits jumped by almost 600,000 between 2014 and 2015. After 15 years of steady growth, last year’s 4m visits was a tipping point, says park ranger Charissa Reid.

The park expects the number to rise in 2016. July is likely to be the first million-visit month in the park’s 144-year history.

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Prof Ed Bullmore from the University of Cambridge discusses a potential revolution: immunopsychiatry

MPs have recommended banning the tiny particles of plastic called "microbeads" which are used in a number of cosmetics and cleaning products. But why have they taken the move?

Previous investigations fail to reveal impact of ‘world’s largest human health threat’ because they do not account for people’s movement, researchers say

The true impact of air pollution has been obscured by the failure to consider people’s exposure as they move around during the day, according to a new study that has mapped the hotspots of New York’s air pollution based on where people gather for work or recreation.

The research cites air pollution as “the world’s single largest environment and human health threat” but laments that the problem has not previously been “considered spatially and temporally”, with most studies basing a person’s pollution exposure on where they live.

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Trash activists from former war-torn countries formed some of the world’s largest cross-border civic movements against rubbish and pollution

Balkan countries once divided by war, nationalism and religion have been quietly uniting to confront a common foe: rubbish.

Under the rubric of the Let’s Do It campaign, Albanian and Kosovar activists jointly cleared their border area and the polluted Lake Vermica last April, in a Wombles-style campaign that has involved more than 5% of Albania’s population, and 7% of Kosovo’s.

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Historian and author of the international bestseller Sapiens: A Brief History of Humankind, Yuval Noah Harari speaks about the future of humanity.

Paula Kahumbu: When will we learn that wildlife conservation is part of wealth creation and not an obstacle to it?

Three days spent in Samburu Reserve to celebrate World Elephants Day with 91 children from Kenya’s poor neighbourhoods, slums and rural areas were probably the most moving experience of my life.

A team of staff, interns and volunteers from my NGO WildlifeDirect put on an ambitious three-day programme of discovery, play and learning for the children. The children experienced a real safari, in a four-wheeled-drive vehicle. They camped for the first time in their lives. They met wild animals in the wilderness of Samburu, and talked to rangers and scientists involved in wildlife conservation.

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China gives the world a first glimpse of the space probe and rover it plans to use in its first mission to Mars in 2020.

Wenlock Edge The rabbit we watched watching us was taking its sentry duty seriously, and had the makings of a dominant adult – if it survived long enough

All ear and eye, the rabbit was as alert as an exclamation mark. It remained still and watchful, as if it thought it was invisible when in fact its attention was so intense it seemed as obvious as a warning beacon in an otherwise languid August afternoon.

The young rabbit was assessing the distance of this particular threat – two people and a dog – the distance to the burrow in the hedge, an escape route across the field, the position of the other rabbits, other potential threats from land and sky.

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Mojo today said it agreed with AGL Energy Chief’s Executive’s comment that the big retailers take their loyal customers for granted and are vulnerable to disruptors.

In a decision that will rank top of the Stupid List, Labor appears to have accepted Coalition plans to strip $1bn from ARENA.

Spark Infrastructure has first hand experience of the impact that renewables have on the wires and poles business and the opportunities and challenges that presents.

In response to the increasing number of women and children fleeing the war in Syria, UNHCR has set up a number of special support centres, also known as “Blue Dot” hubs, along the route through Greece and the Western Balkans specifically catering to their needs.

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If Australia fails to move on its climate policies, it may have no choice but to cut emissions to zero within five years to meet its share of the global effort to avoid a climate crisis. But it's not something that policy makers want to admit.

Investors say countries that move first will attract investments and call for regulators to force disclosure of climate-related risks

A group of 130 institutions that control US$13tn of investments have called on G20 nations to ratify the Paris agreement this year and accelerate investment in clean energy and forced disclosure of climate-related financial risk.

Countries that ratified the Paris agreement early would benefit from better policy certainty and would attract investment in low-carbon technology, the signatories said in a letter before the G20 heads of government meeting in September.

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Tesla's safe yet sexy "family car", the Model X SUV, has arrived in Australia, alongside news of a bigger battery pack and more ludicrous speeds.

Tesla confirms 100kWh battery pack available for Model X and Model S, offering more ludicrous 0-100km/h times at "obviously more expensive" price.

New research suggests that limiting global warming to 1.5℃ rather than letting it reach 2℃ could make a significant difference to the severity of extreme weather events in Australia, and could make all the difference for the Great Barrier Reef.

The solar PV cost reduction spiral reached its lowest point yet at an auction in Chile last week, where a Spanish developer won contracts to sell power from a solar plant high in the Andes for $29.10/MWh.

Can treating the immune system lead to a revolution in treating depression?