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There are 6 billion people in a highly complex barely feeding themselves dependency on agriculture, all evolved for the temperatures and rainfall patterns and weather patterns that prevailed over the past 10 millennia. A pretty limited range and it would be stretching it to say we're feeding everyone.

The total capacity of CURRENT world agriculture production is probably enough to feed world population 2-3 times over.
An enormous amount of calories which could be directly consumed by humans are fed to livestock, at a conversion ratio of 6-10 : 1.
That is, 6 calories of grain to produce 1 calorie of pork.
In the US and the EU, agricultural production is far below capacity, farmers often being paid to produce less and let farmland go fallow.
In other words, if food rationing is introduced, the US and the EU could probably survive on 15% or less of their current agricultural production capacity. There is a huge amount of built-in slack in our food supply.
Also, the US, the EU and other developed nations will be able to adapt to different weather conditions fairly easily (unless we experience rapid shifts occurring over a few years).
This does not apply to the developing world, however. +4 degrees Celsius will make a number of countries along the equator essentially uninhabitable. Productivity in developing countries which are already hot will decline, disease will flourish and agriculture will crater.
Hundreds of millions or even billions will die, but civilization as such is not threatened.
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