Guest essay by David Archibald The gentle, much-appreciated warming of the second half of the 20th century could not have had carbon dioxide as its cause. Carbon dioxide’s logarithmic heating effect is weak at 100 ppm, tuckered out well and truly at 200 ppm and beyond 300 ppm – well never mind. We are now […]

Climate change: It Was The Sun All Along – So Say The Bulgarians — Watts Up With That?