Western taxpayers need the Amazon rainforest to control their climate.

ECONOMIST: Seeing the wood

The peak of her green interest was in the late 80s - a time of bubbling media coverage of acid rain, climate, waste and rainforest destruction.

BBC: Margaret Thatcher: How PM legitimised green concerns

This focus on fracking is part of a larger effort by investors to urge a broad array of companies to increase their attention to the risks posed by climate change, dirty energy sources, water scarcity, rainforest destruction and other global sustainability challenges.

FORBES: Investors Tackle Fracking And Water Scarcity Risks