If we actually had control of the Earth's "thermostat", are we absolutely sure that we'd want to turn it *down*?

From Toronto here:

Councillor Doug Holyday said as long as the city allows the homeless to sleep on the streets, people will freeze to death.

"We shouldn't be leaving people out on the streets in cold weather. There's no question about that. Some people don't have the ability to know how cold it is or how cold it is going to get and they sleep out there," he added.

"They sleep out there, and maybe in the summer time they've been able to do that fine, but when the cold weather hits and they don't know when that's coming, you're certainly going to have people dying on your streets if you let them sleep out there."