David Cameron is hoping to send a tough message on Ukraine from the leaders of the West's largest powers as the G7 summit in Germany concludes today.
The Prime Minister last night held talks with US president Barack Obama at which both agreed the need to maintain harsh sanctions against Russia until Moscow shows it has fully implemented last year's Minsk peace agreement.
Greenhouse gas emissions should be cut to the "upper end" of the recommended 40 to 70 per cent range by 2050, the G7 has declared.
Environmental campaigners welcomed the summit's support for "deep cuts" to emissions, with an intention to completely wipe out the world economy's dependence on carbon by the end of the century.
Greenpeace UK's executive director, John Sauven, said it signalled that "the age of fossil fuels is coming to an end".
Oxfam's G7 spokesman, Jorn Kalinski, also welcomed the promise, but urged leaders to keep their promise to invest $100 billion (£65bn) for climate change action in developing countries.
Barack Obama has urged David Cameron to keep meeting the Nato target of spending 2% of GDP on defence.
David Cameron will use the G7 summit in Germany to call for an international effort to clean up governments and businesses around the world.