Some of the 187 nations participating in the two-week forum promised to offset their so-called carbon footprint by planting trees or buying emission credits. The symbolic actions won't help stop global warming, some scientists say.
``It's very hard for the public to understand that you come together with so many people to a very distant place and cause a lot of emissions, and at the same time talk about emission reductions,'' Artur Runge-Metzger, head of climate strategy for the European Commission, said yesterday in an interview in Bali, adding that he had offset his own emissions.