There remains uncertainty as to how increasing levels of anthropogenic (man-made) greenhouse gas (GHG) emissions will translate into higher global temperatures, as well as the impact of these on the natural environment and human communities in different regions of the world. However there is evidence of: lower atmosphere (troposphere) warming, ocean acidification, sea levels rising, glaciers retreating, a reduction in the increase of crop productivity.

As trees grow, atmospheric CO2 is captured via photosynthesis and the carbon is sequestered within the wood.

The UK is part of the United Nations Convention on Climate Change (UNFCCC), which aims to coordinate international activity to act on climate change (United Nations Climate Change).