Global warming

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More than 160 nations will sign the Paris Agreement on its opening day – a record for a United Nations treaty. Aotearoa/Wikimedia Commons

The Paris Agreement signing ceremony at a glance

More than 160 countries are expected to sign the Paris Agreement in New York on April 22. But enough countries will also need to ratify the treaty domestically before it can become international law.
Glaciers have been a major contributor to sea-level rise. Knut Christianson

What does the science really say about sea-level rise?

Could sea levels really rise by several metres this century. Probably not, although this century's greenhouse emissions could potentially set the stage for large rises in centuries to come.
Extreme drought, a predictable impact of El Niño, fuels wildfires on the island of Borneo on October 14. NASA/GSFC/LaRC/JPL-Caltech, MISR Team

What North America can expect from El Niño

The third-ever 'super' El Niño is under way. Here's how it will affect your region in the US and how global warming affects this and future El Niños.
Brian Snyder/Reuters

Who feels the heat first?

At yesterday’s COP21 science briefing, University of Reading climate scientist Ed Hawkins displayed a chilling (pun intended) colour-coded world map. Nation by nation, it showed which countries are already…

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