Do we only have 12 years to prevent a climate change catastrophe?

The idea of a 12-year deadline arose in the fall of 2018 with the release of a special report from the United Nations Intergovernmental Panel on Climate Change. A group of climate scientists from around the world said that if the planet's governments want to limit global warming to 2.7 degrees Fahrenheit (1.5 degrees Celsius) above preindustrial temperatures, a mere 1 degree Fahrenheit above today’s levels, society will have to reduce its greenhouse gas emissions by about half by 2030. This is what 804 people say. What is your opinion?