WASHINGTON – Many damaging effects of climate change are already basically irreversible, researchers declared Monday, warning that even if carbon emissions can somehow be halted temperatures around the globe will remain high until at least the year 3000. "People have imagined that if we stopped emitting carbon dioxide the climate would go back to normal in 100 years, 200 years; that's not true," climate researcher Susan Solomon said in a teleconference. Solomon, of the National Oceanic and Atmospheric Administration's Earth System Research Laboratory in Boulder, Colo., is lead author of an international team's paper reporting irreversible damage from climate change,...