"Climate change fight 'can't wait'

In the past two weeks global warming has been on the agenda again. The news hasn't been good, but world leaders are concerned. Read this BBC text to know more.

The world cannot afford to wait before tackling climate change, the UK prime minister has warned.

A report by economist Sir Nicholas Stern suggests that global warming could shrink the global economy by 20%.

But taking action now would cost just 1% of global gross domestic product, the 700-page study says.

Tony Blair said the Stern Review showed that scientific evidence of global warming was "overwhelming" and its consequences "disastrous".