Climate change wont directly lead to death, we'll have to adapt, but there are models showing more food produced from climate change. Simply put, we don't know what potentially will happen. We highly suspect there are 150 thousand increase in death from disease due to climate change[2]
In contrast... there are 135 - 270 MILLION people on the verge of starvation now; due to the policies around covid (or >2% of the worlds population).
> “marching towards starvation” spiking from 135 million to 270 million as the pandemic unfolded. He stressed that 2021 will be catastrophic [2]
BTW these people are still getting covid too, lockdowns slowed the spread, didn't stop it. Most American's have already gotten the disease (estimates are that 10x the number of people have gotten it over the tests[3]). Given 25 million have tested positive, by the prior estimates, that means a likely 250 million Americans have already gotten covid [4].
[1] https://www.who.int/heli/risks/climate/climatechange/en/
[2] https://www.un.org/press/en/2020/ga12294.doc.htm
[3] https://www.businessinsider.com/us-coronavirus-cases-deaths-...
Total global food production hasn't been an issue in hunger in the modern era, so boosting it is immaterial in this context.
Moving it out of existing populated places that are already marginal and have litle export industry to purchase imports with, OTOH, will be disastrous, even if Russia and Canada get a huge boost in arable land.