There is simply no other mechanism that can explain the significantly altered climate path and the changes in the radiative forcing other than human causes. (ossfoundation.us)
One of the main reasons for this is that the favorable climate paths to new environments are inconsistent, varying in size with the average temperature. (scientificamerican.com)
«This is something we've definitely been concerned about,» says ecologist Lee Hannah of Conservation International, who has studied climate paths in South Africa and Mexico and is part of the managed relocation working group. (scientificamerican.com)