what we think we know: possible doubts

'No solution' found in more trees
Planting trees to curb the effects of global warming is unlikely to work.

Tree planting warning over global warming

Ethanol cars may not be healthier
Ethanol vehicles may have worse effects on human health than conventional petrol, US scientists have warned.
Snowy forests 'increase warming'
Planting trees in snowy areas may worsen global warming as their canopies absorb sunlight which would otherwise be reflected by the snow, a study says.
Rwanda's underwater powerhouse
Africa is the continent which will suffer the worst effects of climate change.
It also has some of the answers.