Sorry dude but your vision is a bit simplistic.
The Global Warming this is not having summer-vacation-like weather all year long, as you may think. No, Global Warming, means, more and more frequent episodes of heat waves, you know, when the air is so hot, that you feel like your skin is burning, and causing giant fires like in Australia and the USA. There is also severe dryness, and considering that water is the most precious element of life on Earth, you can see the impact that recurring and longer episodes of dryness can produce. No, it will not help producing more vegetables and food, that is the opposite, it's causing famine.
Also, warmer weather, contributes to the expansion of the territories of insects, such as mosquitos, which are carrying diseases much worse than the flu.
You also have glaciers and ice from the poles meting. People don't often think of it, but this has terrible impact and consequences. Beside the increase of the level of the oceans, and the flooding of coasts, this mass of cold water are cooling the oceans, and since the ocean have a role in regulating the climate on Earth, you can easily understand how things are messing up.
However, it's true that the global warming mechanism can't be reverted, and is part of a cycle, but, this is not a reason to give up, and just let things run their path. This is important that Humanity controls and reduces its impact on its environment, and learns to live in better harmony with the Mother Nature who made us.