I don't.............they have pictures from the 40's here in AU where it is drier than now...........
The planet regularly goes through cycles of heat and cold, primarily based upon the activities of the SUN.......and if anything, HUMANITY is influencing the weather through clear cutting rain forests, building cities out of concrete and asphalt, HAARP, seeding the clouds with barium and aluminium oxide in chemtrails to bio-engineer the planet and control the weather etc............
And if one really wants global warming.....JESUS will warm the GLOBE in his wrath when he burns the heavens and the earth