Hot summer days

It was around 40 degree Celsius yesterday.
As I remember correctly, the average temperature in summer was around 30 degree Celsius when I was a child. Of course, it was hot but not as hot as it is now.

According to the morning news today, the worst-case scenario is that the temperature could rise by 4.4 degree Celsius in 2100. It is 80 years to come. I wouldn't be alive at the time but my children need to survive in the world.

What have caused climate change?
It is said that human activity is the main cause of it. Burning fossil fuels and converting land from forests to agriculture, which produe carbon dioxide and a greehouse gas.
As long as we change our life or activity now, we need to face the inevitable future.