ESS11
Prof. Jin-Yi Yu
Is Global Warming Really A Catastrophe?
Ice-free Earth
q Global
temperatures have been much higher and much lower than they are today.
q Many factors have kept temperature extremes
of our planet from approaching those prevail on Venus and Mars.
q Life has been on Earth for more than three
billion years.
q From the perspective of the entire biosphere,
our planet
may seem robust.
(from Earth’s Climate: Past and Future)