The significance is that an adrupt climate change will disrupt both agriculture and the distribution system that modern civilization depends on. With the resultant famines. In June, Russia was predicting a harvest of grain that would exceed 93 million tons, 18 million tons over what Russia uses. The hot, dry weather and fires have reduced that harvest to less than 60 million tons, meaning that Russia will have to import 15 million tons. And then you have Pakistan, where virtually the whole of the argiculture was wiped out by monsoon floods.
Our agriculture is at the mercy of the weather. Significant changes in weather patterns means that we lose major sections of it. In a world of nearly 7 billion people, that leads to famine.
It hasn't happened all the other times the temps have risen. What makes this time so special?