By Alex Therrien
Bill Gates talks to the BBC's Justin Rowlatt about his views on the environment, the future of the planet and how businesses and consumers can help slow global warming.
By Roger Harrabin
BBC environment analyst
By Steffan Messenger
BBC Wales environment correspondent
Climate change has been blamed for the increasing numbers of landslips into the Welsh reservoirs.
By Kevin Keane
BBC Scotland's environment correspondent
By Mark Kinver
By Douglas Fraser
Business and economy editor, Scotland
By Victoria Gill
Science correspondent, BBC News