How to Limit Global Warming to 1.5 Celsius by 2100

The current aim by over 100 countries across the world is to set a goal to limit global warming to 2 degrees Celsius or less by 2100.
What type of effort would it take to limit the temperature increase to 1.5 degrees Celsius or less by the end of this century?
A new study from the Institute for Applied Systems Analysis (IIASA) and the Potsdam Institute for Climate Impact Research (PIK) focused on scenarios for the energy, economy and environment that could limit global warming to 1.5 degrees Celsius above pre-industrial levels by 2100.
The research team found that achieving this more agressive goal was indeed feasible.
1. The study determined that there is no time for delay as we need to scale up global carbon mitigation and emissions reductions within the next decades.
2. The remaining carbon budget for the 21st century would have to be reduced to half of the currently accepted 2 degrees Celsius limit scenario.
3. Carbon emissions would have to become negative at a global scale at some point this century. How? Through bioenergy use, carbon capture/storage and growing more forests.
Carbon capture and storage diagram.
Quote from the IIASA report.....
"Basically all our 1.5 deg. C scenarios first exceed the 1.5°C temperature threshold somewhere in mid-century," explains Joerl Rogelj, lead author of the study "before declining to 2100 and beyond as more and more carbon dioxide is actively removed from the atmosphere by specialized technologies".
The report makes it clear that an increase in international efforts to curb greenhouse gases is imperative to keep the 1.5 degree C. goal as reachable.

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