We need a big volcano

With tiger mosquitoes surviving in a suddenly-tropical Italy and spreading chikungunya, this whole global warming thing has gone too far.
No matter the 'real' cause of global warming, we need a couple of really big, Mt. St. Helen-sized volcanoes to erupt soon and drop the global temperature a couple of degrees and get this mosquito thing handled.
Otherwise it's going to be time to box up the polar bears and ship them off to Antarctica... (And won't the penguins be surprised.)