World powers accept warming limit

Developed and developing nations have agreed that global temperatures should not rise more than 2C above 1900 levels, a G8 summit declaration says.

That is the level above which, the UN says, the Earth’s climate system would become dangerously unstable.

US President Barack Obama said the countries had made important strides in dealing with climate change.

But the G8 failed to persuade developing countries to accept targets of cutting emissions by 50% by 2050.