Canada’s new environment minister Steven Guilbeault has a lot on his plate as the  government seeks to tackle what it says is the existential threat of climate change. Guilbeault received his mandate letter from Prime Minister Justin Trudeau on Dec. 16, which contains twice as many issues to pursue compared to the former minister in 2019. “The length of the list speaks to the scale of both the challenge and the opportunity,” Guilbeault tweeted on Dec. 17. “This is a priority for Canadians, who gave us this mandate. I’m humbled to be a part of it. On y va [Let’s go]!” Many directives remain the same as 2019, such as achieving net-zero emissions by 2050, but the 2021 letter adds that the net-zero goal should be achieved “as soon as possible.” Some previous objectives have also been tweaked to speed up their implementation, such as regarding the sale of zero-emission …