According to WHO the reasons are

1) Climate change is directly contributing to humanitarian emergencies from heatwaves, wildfires, floods, tropical storms and hurricanes and they are increasing in scale, frequency and intensity.

2) Research shows that 3.6 billion people already live in areas highly susceptible to climate change. Between 2030 and 2050, climate change is expected to cause approximately 250 000 additional deaths per year, from undernutrition, malaria, diarrhoea and heat stress alone.

3) The direct damage costs to health (excluding costs in health-determining sectors such as agriculture and water and sanitation) is estimated to be between US$ 2–4 billion per year by 2030.

4) Areas with weak health infrastructure – mostly in developing countries – will be the least able to cope without assistance to prepare and respond.

5) Reducing emissions of greenhouse gases through better transport, food and energy use choices can result in very large gains for health, particularly through reduced air pollution.”

In my opinion one of the most alarming results of climate change is that it is accelerates the loss of biodiversity. The current rate of species extinction is estimated to be 100 to 1,000 times higher than the natural background rate. According to the WWF’s Living Planet Report, ”there has been an average decline of 68% in vertebrate populations (mammals, birds, amphibians, reptiles, and fish) between 1970 and 2016.”

In the last 200 years the percentage of people worldwide living in extreme poverty has dropped from 90% to less than 10% today.

Since 1900 the population of humans on earth has trebled, life expectancy has doubled, and deaths from natural disasters have fallen by 98%.

In the last 50 years global production of wheat and rice has trebled and production of corn has quadrupled. These three crops provide nearly 50% of food energy for all the humans on earth. In recent decades surface vegetation has also been increasing by 4-5% per decade.

Since the year 2000 global deaths from malaria, one of the biggest killers of people on earth, have declined by 50%.

What about those pesky polar bears? Their numbers have increased roughly three fold in the last 60 years.

Pretty hard to see where the problem is.

last four and a half billion years, the climate of our planet has been constantly changing with no help from us, so let’s all just get on with our lives shall we?