The Intergovernmental Panel on Climate Change released its fifth report on Friday . J. Marshall Shepherd : Yes , topics of uncertainty exist in climate science as in any science , but this does not render the science unusable . The report affirms that our planet is warming and humans are a factor . He says extreme weather and climate threaten our health , safety and national security . Shepherd : Despite uncertainty , analysis shows warming that we should n't ignore .
The Intergovernmental Panel on Climate Change released its fifth report on Friday . J. Marshall Shepherd : The report affirms that our planet is warming and humans are a factor . He says extreme weather and climate threaten our health , safety and national security . Shepherd : Despite uncertainty , analysis shows warming that we should n't ignore .