Dr Matt Rigby, Reader in Atmospheric Chemistry, University of Bristol
How much greenhouse gas is emitted by any individual country? With global emissions of carbon dioxide hitting a record of 36.8 billion tonnes this year, and delegates gathering in Madrid for the latest UN climate talks, it’s a pressing question.
One might assume that we know precisely how much is emitted by any given country, and that such figures are rigorously cross-checked and scrutinised. And in some respects, this is true – countries are required to report their emissions to the UN, based on exhaustive guidelines and with reams of supporting data.
Yet these reports are based on what are known as inventory (or “bottom-up”) methods. To simplify, this means that governments figure out how much greenhouse gas is emitted by a typical car, cow, or coal plant, and then add up all the cows, cars and so on to get an overall emissions figure. Continue reading →
Water is essential for human life, but in many parts of the world water supplies are under threat from more extreme, less predictable weather conditions due to climate change. Nowhere is this clearer than in the Peruvian Andes, where rising temperatures and receding glaciers forewarn of imminent water scarcity for the communities that live there. Continue reading →
The recent collapse of a bridge in Grinton, North Yorkshire, raises lots of questions about how prepared we are for these sorts of risks. The bridge, which was due to be on the route of the cycling world championships in September, collapsed after a month’s worth of rain fell in just four hours, causing flash flooding. Continue reading →
After occupying parts of central London over two weeks in April, Extinction Rebellion’s (XR) summer uprising has now spread to Cardiff, Glasgow, Leeds and Bristol. All these protests involve disruption, breaking the law and activists seeking arrest.
Emotions are running high, with many objecting to the disruption. At the same time, the protests have got people and the media talking about climate change. XR clearly represents something new and unusual, which has the power to annoy or enthuse people. But what led it to adopt such disruptive tactics in its efforts to demand action on climate change? Continue reading →
Antarctica is further from civilisation than any other place on Earth. The Greenland ice sheet is closer to home but around one tenth the size of its southern sibling. Together, these two ice masses hold enough frozen water to raise global mean sea level by 65 metres if they were to suddenly melt. But how likely is this to happen? Continue reading →
Hidden in even the clearest waters of the ocean are clues to what’s happening to the seas and the climate on a global scale. Trace amounts of various chemical elements are found throughout the seas and can reveal what’s going on with the biological reactions and physical processes that take place in them. Continue reading →
Lehman Brothers filed for bankruptcy on September 15, 2008. The investment bank’s collapse was the drop that made the bucket of global finance overflow, starting a decade of foreclosures, bailouts and austerity. Continue reading →
The international community has widely acknowledged the severe threats posed by the impacts of climate change to a series of human rights, including the rights to life, health, and an adequate standard of living. But a stark gap has emerged between this acknowledgement in global climate policy – evidenced by a non-binding clause in the preamble of the Paris Agreement – and their actions to meet promised targets. Continue reading →
If we have to feed 9.8 billion people by 2050, food from the ocean will have to play a major role. Ending hunger and malnutrition while meeting the demand for more meat and fish as the world grows richer will require 60% more food by the middle of the century.
But around 90% of the world’s fish stocks are already seriously depleted. Pollution and increasing levels of carbon dioxide (CO₂) in the atmosphere, which is making the oceans warmer and more acidic, are also a significant threat to marine life. Continue reading →