Simon Donner: The human role in this summer's heat

Extreme heat, fires and smoke across Canada and elsewhere in the northern hemisphere this summer have killed people, driven others out of homes, and hurt businesses.
The human suffering is a stark reminder that climate change is about so much more than the environment.
Climate change is about us. It is about our legacy. We are seeing the legacy of past greenhouse gas emissions in this summer’s heat and human suffering.
Yet when you ask a climate scientist the popular question — &ldqu