Arctic warming is thawing the permafrost and releasing methane into the atmosphere. Scientists warn of similarities to the world's greatest extinction, the Permian extinction.
The Earth's climate is predicted to return to a state not seen for millions of years. The change may occur surprisingly soon.
One climate disaster could trigger another, like falling dominoes. In one scenario, melting icesheets in Greenland could shut down the Gulf Stream, warm the Antarctic, and speed up the disappearance of the Amazon rainforest.
Climate change is thinning clouds. Latest models predict the disappearance of the most common cloud - stratocumulus - leading to an 8 °C (14.4 °F) rise in global temperatures.
Global warming from volcanoes has led to mass extinctions in the past. We could be following the same steps, taking us on a path from global warming to global mass extinction.
Inhabitants of Africa's Sahel region struggle to survive in difficult conditions. These may worsen. Scientists worry that mega-droughts lasting for centuries may return with climate change.
Mega-droughts lasting decades or centuries have brought down civilisations throughout history. Longer, more frequent and more intense droughts are predicted for later this century around the world.
Heatwaves too hot to survive are forecast for later this century. Deadly mega-heatwaves lasting months are predicted every other year for regions around the world. Billions will be affected.