The hike - announced as George Osborne set out £11.5billion of Whitehall budget cuts last month - was branded a "total waste of money" after being uncovered by The Sun.
The UK will dole out £969MILLION on foreign green projects - including wind farms in Africa and forestry in Nepal - by 2015-16, up from £930million a year earlier.
The extra is part of a pledge to hand 0.7 per cent of our income over to poor nations.
The overall annual foreign aid budget is ballooning to £12.2billion - equivalent to £462 per UK household.
Peter Bone, Tory MP for Wellingborough in Northants, blasted: "To spend nearly £1billion a year on overseas aid is difficult enough. But when it is spent on climate change it seems a total waste of money."
Brigg and Goole MP Andrew Percy added: "Constituents will accept it if it is being spent stopping people starving - not
silly budgets like this one."
But a Government spokesman said: "We cannot have food security, water security or energy security unless the world tackles climate change."