You are both saying the same thing. Global warming can be a mixed blessing. You do have a longer growing season. But some plants cannot adjust to even one degree. For example some of the plants in the coral reef are dieing off because of the one degree increase in temps. King Crabs are moving into areas that were to cold before and eating so much as to upset the balance of that eco system. But for people who like to eat King Crabs the harvest is substantial. That does not seem to help the price though. They are still 300 feet down in what is cold water to us. So it is not all that easy to harvest them.
I'm sure there will be regions that do benefit, but only at the expense of others that may experience more drought or even too much rain. This is already being seen many regions around the world. The trouble with climate regions migrating is that it may not support the needed agriculture due to urbanization. No doubt that it is happening slowly, and that makes a lot of people unconcerned. Some estimates of sea level rise are as much as 6ft by the end of the century. That won't affect us, but it will the following generations.
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