To date, the only explanation that matches those observations are a concurrent rise in greenhouse gas concentrations in the atmosphere. (scientificamerican.com)
This is evident from the increasing greenhouse gas concentrations in the atmosphere, positive radiative forcing, observed warming, and understanding of the climate system. (dotearth.blogs.nytimes.com)
Despite all this evidence, plus the well - documented continual increase in atmospheric greenhouse gas concentrations, societies have taken little action to address this global - scale problem. (dotearth.blogs.nytimes.com)