Overpopulation is the main cause of climate change - according to me.

The UN says: - 

http://esa.un.org/unpd/wpp/publications/files/key_findings_wpp_2015.pdf

'According to the results of the 2015 Revision, the world population reached 7.3 billion as of mid- 2015 implying that the world has added approximately one billion people in the span of the last twelve years.

Today, it is growing by 1.18 per cent per year, or approximately an additional 83 million people annually. The world population is projected to increase by more than one billion people within the next 15 years, reaching 8.5 billion in 2030, and to increase further to 9.7 billion in 2050 and 11.2 billion by 2100.'

More people, more consumers of everything, more people looking for jobs, more demands for food and land and property, coal, oil, power.

Unless something is done soon the earth will be so heavy with humans it will probably tip over (unscientific).

What's the point of climate change talks and emissions controls? 

The earth is heading for disaster unless we control  population growth. 

Forget populate or perish it's becoming a case of populate and perish.

Governments don't want to reduce the number of tax payers, religions want more followers, businesses want more customers and earth dwellers want more stuff.

Be happy in the sun (don't forget a hat and sunscreen) and do no harm.