Key points from article :
Gases responsible for global warming reached a new high in 2017.
Mainly carbon dioxide, methane and nitrous oxide are most responsible for climate change.
Carbon dioxide levels reached 405 parts per million (ppm) in 2017, a level not seen in 3-5 million years.
The banned gas CFC-11 also resurfaced and was linked to factories in China.
Need deep and rapid reductions of emissions of carbon dioxide and other greenhouse gases in all sectors.
Study by World Meteorological Organization, published in their annual greenhouse gas bulletin.
