Achieving the 450ppm atmospheric CO2 goal.
StratoSolar all energy solution for the UK
This active map shows twelve 60GWp StratoSolar power plants positioned above the locations of current nuclear power plants in the UK. This is sufficient to provide all UK energy (not just electricity) and could be deployed incrementally by 2050. Use the controls to zoom in and view PV plants from viewpoints of interest. Contrast this with the land use, cost and environmental impact of several possible UK alternative energy solutions described in depth in David MacKay's book "Sustainable Energy - without the hot air".