Even if humans are not actually the "chief" cause of...
Even if humans play a smaller role in climate change, Kyoto is still good.
Even if humans are not actually the "chief" cause of global warming, there is little dispute that we play some role, due to our emissions of greenhouse gases, which contribute to the warming of the globe. As such, the Kyoto Protocol is an important tool in the fight against human-caused greenhouse gas emissions and global warming.