It is very simple to understand why the poorest nations are hit with higher intensity by the effects of the Global Warming.
Take the statement 1:
As much poor a nation as much it takes the national income directly out of the natural resources through farming (As a typical situation).
Take the statement 2:
As much a nation takes the national income out of the natural resources through farming, as more vulnerable it is to the Global Warming effects through extreme climate events.
Take the statement 3:
As poorest a nation is less resources it has to countervail the negative effect when it is hit on its vulnerabilities.
Take the statemente 4:
As much a nation takes the national income out of the natural resources through farming, as less it emits carbon dioxide.
Then, as result of the Climate Change:
The hardest hit nations are the less contributors, historically and presently, to the Global Warming.
But UN projects for poorest are 'feared frozen'