Average human loss in Natural or weather related catastrophes per year: 106,000 worldwide

Globally, losses from natural catastrophes in 2013 were somewhat more moderate: the direct overall losses of around US$ 125bn and insured losses of around US$ 31bn remained below the average figures of the past ten years (US$ 184bn and US$ 56bn). Regrettably, in a total of 880 natural catastrophes (average of the past ten years: 790), more than 20,000 people were killed. This meant that the death toll was higher than in 2012, but significantly below the average of the past ten years (106,000).
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Muenchener Rueckversicherungs-Ges. AG : Munich Re-Overall picture of ...

Though this is the average number for the past 10 years, this average number is likely to rise dramatically over the next 10 to 20 years as the oceans rise, get warmer in general etc. So, I expect as an intuitive about 1 1/2 to 2 times this average during the next 10 to 20 years. Though it is possible this average might be reduced if for example, high atmospheric seeding in the arctic with pyroclastic glass particles (volcanic glass dust particles) to reduce arctic temperatures was done by the UN or individuals interested in reducing temperatures in the arctic because keeping arctic ice in place likely could stabilize the numbers of deaths at their present numbers during the next 100 years or so.

Not doing anything likely will see average deaths at 500,000 or more by 2100.

However, there might be people that would make the following argument. "We used to have wars to reduce populations and also plagues reduced populations. If because of nuclear weapons and advances in medical science we can't reduce populations, maybe we should allow global warming to reduce populations for us?"

This is a self defeating proposition because the end result of doing nothing is either something like Venus or Mars where nothing can live at all.