The G20's power comes from its members, but also vital is its informal structure and close working relationship with other international organisations.
In order to address a warming planet over the medium and long-term, climate policy must be designed to be adaptable and indeed attractive to those across the political spectrum.
As climate extremes mount, let's reflect on Victorian London's 'Great Stink' sewage crisis - when things finally became so bad authorities were forced to accept evidence, reject sceptics, and act.
The risk of urban flooding is rising. Overall, residents and municipalities are ill prepared, but there are steps homeowners can take to protect themselves.
Canada has made strides, but we're still far from being a climate leader. Budgeting our emissions would help bring us to the front of the pack.
The first IPCC conference on cities has highlighted the challenges of reconciling science, urban practices and politics. But it was an important recognition of cities' leading role in climate action.
The European Investment Bank's funding of the Trans Adriatic Pipeline will harm the climate and makes little financial sense.
New analysis shows British cities how to save money, reduce emissions and make life better for citizens.
It's a good thing that cities aspire to lead the way in acting on climate change in the absence of stronger national action. But a closer look reveals the limitations of current city-based efforts.
A new study confirms what many already know: Exxon for years sowed uncertainty and doubt about climate change in the public. Should scientists reject certain funding sources?
The Paris climate agreement aims to keep restrict global warming to within 2℃ above 'pre-industrial levels'. But what does that mean, exactly?
Economic forces – alongside a moral imperative – are driving cities, states and companies to make changes to forestall climate change, regardless of the whims of the White House.
Messaging for the April 29 People's Climate March is stressing collective resistance against President Trump. This theme may appeal to activists, but is unlikely to grow the movement.
Why, after decades of international agreements, are we still damaging the environment? New research, looking at dozens of unsuccessful policies, has uncovered the basic elements of failure.
To weigh the economic impact of climate change policies, we need to estimate the social cost of carbon. An economist explains how it's done and why the Trump administration shouldn't end the practice.
The Trump administration may reverse a recent push to require oil companies to disclose more information about climate change risks to investors. Is that a good thing?
Although Donald Trump has called climate change a hoax invented by China, Chinese leaders believe cutting carbon emissions will generate economic and political payoffs at home and abroad.
President Trump's 2018 budget request cuts funding for NASA Earth observation research and cancels four missions. Weather forecasters, businesses, scientists and the armed forces rely on this data.
Whether it's Clinton on Trump in the White House, progressive action on climate change in America - and therefore globally - is going to take a hit.
The SEC and others are pressing Exxon to disclose more climate change risks to investors. But new research suggests shareholders are already pricing in those costs on their own.