A sobering new study to be published in "Nature." If we do nothing about climate change (fossil fuel addiction) by 2023 we can expect to see catastrophic climate changes in the tropics and extreme weather in the northern hemisphere as well. By 2036 we, on the rest of the planet will start to see catastrophic climate changes leading to severe times by 2047 that will make life extremely difficult. If we do start now to greatly curtail our CO2 emissions, we can push these times back, but can't no longer expect to avoid what's coming (only reduce some of the harshness). We have blown it already, question is how much punishment do we want to lay on our children and future generations?