Money is the key to the success of Copenhagen. America's most toxic cities. Study cites prevalence of BPA. Feds say Muni workers let fuel spill into bay. Mandela leads global elders coalition to halt climate change. Thinning Of Greenland And Antarctic Ice China Pledges to Curb CO2 Emissions Calif. bans household aerosols, paint thinners, solvents. Natgas execs seek disclosure of Marcellus drilling chemicals. Senate approves amendment to buy out polluted town.