Increasing acidity in the Southern Ocean is slowing the growth of diatoms, reports Tim Radford. Why worry? Because these tiny plankton sustain essential marine ecosystems, and are highly effective at drawing CO2 down into the deep ocean.
The same pattern of severe droughts that extinguished the Ancient Pueblo culture of the southwest US in the 13th century will come back with a vengeance later this century as climate warms and dries, writes Tim Radford. And it could have precisely the same effect on the region's modern-day residents.
Human exploitation of peatlands has led to some of the biggest fires on Earth, including one in Indonesia that released 2.5 Gt of carbon, writes Tim Radford. A new study calculates that the world's peatlands contain almost a trillion tonnes of carbon at growing risk of burning.
As temperatures rise in the Southern Ocean, warmer currents are eroding the Antarctic ice sheet from below, writes Tim Radford - causing the melting rate to treble in two decades to 83 billion tonnes a year.
The expected melting of sea ice in Canada's Arctic Archipelago will progressively render huge areas unable to support viable polar bears populations, writes Tim Radford. By 2100 the polar bears could be pushed out altogether.
As land rights of indigenous peoples are increasingly being violated, writes Tim Radford, new research shows that the planned destruction of the Amazon rainforest is a major threat not only to cultural identity but also to the global climate.
The increase in meat and dairy consumption is set to cause huge increases in greenhouse gases, reports Tim Radford. A shift to less animal-based diets would cut greenhouse gases, conserve forests and grasslands - and make us all healthier, with reduced obesity, diabetes and associated conditions.
A spellbinding solo performance by veteran climate scientist Chris Rapley at London's Royal Court puts the climate debate centre stage, writes Tim Radford - and earns the admiration of hard-to-please theatre critics.
Death threats, abuse and torrents of online hatred show how climate change scientists are demonised, writes Tim Radford, in a way without parallel in the history of science. It's all set out in a new book that explores both climate change denialism, and our inaction despite overwhelming evidence: 'Don't Even Think About It'.
Scientific studies show that as carbon dioxide acidifies the oceans, sharks are less able to detect prey, and their chances of survival are reduced, writes Tim Radford - with serious consequences for ocean ecology.
Agricultural pests - viruses, bacteria, fungi, blights, mildews, rusts, beetles, nematodes, flies, mites, spiders and caterpillars - are spreading thanks to trade, travel and global warming, writes Tim Radford. The world faces a dire future of increased crop losses and growing insecurity.
As greenhouse gases raise temperatures in Europe, writes Tim Radford, British researchers warn that the risk is increasing of the arrival of dengue fever and other mosquito-borne killer tropical diseases.
Scientists in the US have established that chemicals used in fracking to extract gas and oil could represent health and environmental hazards, writes Tim Radford. Among the greatest hazards: biocides and corrosion inhibitors.
Australia's prime minister thinks climate change is 'crap' and has just abolished his country's carbon-pricing system. But scientists say that it's rising levels of CO2 that are leaving the south of the country parched and sweltering - and it's only going to get worse.
A failure to act to reduce the impacts of climate change could cost Europe almost €200 billion and 200,000 lives a year, writes Tim Radford. These 'conservative estimates' are published in a new European Commission study.
Log books from British whaling ships more than 200 years ago have given new insights into the history of the Arctic sea ice, reports Tim Radford. A new study reveals that the scale of ice melt in the Arctic over the last few decades is new and unprecedented.
A new GM bacterium can produce bioethanol from coarse switchgrass, rather than using food crops like maize, writes Tim Radford. It does this by 'digesting' the tough cellulose that yeasts are unable to break down.
Greenland's glaciers are more vulnerable to global warming than had previously been feared, reports Tim Radford, as ice bodies are undercut by seawater. The threat of rapidly rising sea levels just went up yet another notch.
The total collapse of glaciers in West Antarctica is 'inevitable', writes Tim Radford, as the southern hemisphere gets warmer and glaciers are undermined by seawater. The news has emerged from a new analysis of satellite data.
Rising greenhouse gas levels are causing stronger winds over the Southern Ocean. It's good news for Antarctica, writes Tim Radford, as the circumpolar winds are keeping its ice caps cold. But Australia is getting hotter and drier - and its problems will only increase.
Scientists have found that the world's second greatest rainforest, the Congo, is losing its green, writes Tim Radford. As temperatures rise and rainfall reduces, the forest canopy is taking on a browner hue, and this could be an early signal of worse damage to come.