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Lighter-coloured crops, aerosols in the stratosphere and iron filings in the ocean are among the measures being considered by leading scientists for "geo-engineering" the Earth's climate, leaked documents from the UN climate science body show.

On the eve of climate talks that began last week, the UN's climate chief, Christiana Figueres, told the Guardian: "We are putting ourselves in a scenario where we will have to develop more powerful technologies to capture emissions out of the atmosphere."

Keynote abstracts ahead of a geo-engineering expert group meeting in Lima in Peru next week

Artificial clouds and creating colossal blooms of oceanic algae are among the ideas scientists say must now be considered