and mask the warming effects of greenhouse gases. Climate researcher James Hansen estimates that "global dimming" is cooling our planet by more than a degree Celsius (1.8°F) and fears that as we ...

James Hansen, a well-known climatologist ... it would mean that the cooling effect of air pollution has masked the full impact of greenhouse gas warming. Hansen and his colleagues warn that ...

James Hansen, a well-known climatologist ... It would mean that the cooling effect of air pollution masked the full impact of greenhouse gas warming. Hansen and his colleagues warn that this ...

James Hansen, a well-known climatologist ... it suggests that the cooling effect of air pollution may have been masking the full impact of greenhouse gas warming. Hansen and his colleagues warn ...

James Hansen, the climate scientist ... when we used aerosols to offset almost half of greenhouse gas warming,” said Hansen at a briefing hosted by the United Nations Sustainable Development ...