Garden Island: A year ago James Hansen, director of NASA’s Goddard Institute for Space Studies, published a study in the journal Atmospheric Chemistry and Physics concluding that just 10 more years of business as usual emissions from the burning of coal, oil and gas will make disastrous global results all but impossible to avoid. The study described various climatic possibilities called tipping points. These tipping points, also called nonlinear events, both accelerate climate change and are …