referring to all of humanity on Earth...

"The best evidence indicates that we need to reduce our CO₂ emissions by 70 per cent by 2050."

--Tim Flannery (environmental scientist, conservationist, explorer, writer, global warming activist)

Source: The Weather Makers: How Man is Changing the Climate and What It Means for Life on Earth (2005, p. 6) (by Tim Flannery) (book first published 2005)

"Scientists say that a 70 percent reduction in CO₂ emissions from 1990 levels by the middle of the twenty-first century is required to stabilize Earth's climate."

--Tim Flannery (environmental scientist, conservationist, explorer, writer, global warming activist)

Source: The Weather Makers: How Man is Changing the Climate and What It Means for Life on Earth (2005, p. 168) (by Tim Flannery) (book first published 2005)

"Cuts of 70 percent by 2050 are required to keep atmospheric CO₂ at double the preindustrial level."

--Tim Flannery (environmental scientist, conservationist, explorer, writer, global warming activist)

Source: The Weather Makers: How Man is Changing the Climate and What It Means for Life on Earth (2005, p. 224) (by Tim Flannery) (book first published 2005)