The United Nations have warned all the countries to cut Carbon-dioxide emissions to zero by 2070 to keep global warming below dangerous levels and prevent a disaster.
According to the United Nations Environment Programme (UNEP) report, by 2100, all greenhouse gas emissions — including methane, nitrous oxide and ozone, as well as CO2 — must fall to zero or else the world will face severe, widespread and irreversible effects from climate change.
Since emissions surged in the late 19th century, some 1,900 Gigatonnes (Gt) of CO2 and 1,000 Gt of other greenhouse gases have already been emitted, leaving less than 1,000 Gt of CO2 left to emit before locking the planet in to dangerous temperature rises of more than 2C above pre-industrial levels.
All scenarios in the UNEP report now require some degree of ‘negative CO2 emissions’ in the second half of the century, through technologies such as carbon capture and storage or, possibly, controversial, planetary wide engineering of the climate known as geo-engineering.
The EU has not, however, supported UNEP’s call for zero greenhouse gas emissions by 2100 .