Cutting down trees is not good for the environment - and is particularly bad for keeping down climate change:
Futures Forum: Climate change and the importance of halting rainforest destruction
The most spectacular impacts are in tropical parts of the world:
Futures Forum: Climate change: "paying developing countries to halt tropical deforestation would be one of the most cost-effective ways to tackle global warming."
But the UK is also implicated - and can do something:
How deforestation and climate change link - Woodland Trust