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* Draft report outlines solutions to climate change
* World doing too little to meeting temperature goal-UN
* Suggestions include burying emissions, planting more trees
Governments may have to extract vast amounts of greenhouse gases from the air by 2100 to achieve a target for limiting global warming, backed by trillion-dollar shifts towards clean energy, a draft U.N. report showed on Wednesday.
A 29-page summary for policymakers, seen by
Reuters, says most scenarios show that rising world emissions will have to plunge by 40 to 70 percent between 2010 and 2050 to give a good chance of restricting warming to U.N. targets.
The report, outlining solutions to climate change, is due to be published in Germany in April after editing by the Intergovernmental Panel on Climate Change (IPCC). It will be the third in a series by the IPCC, updating science from 2007.
It says the world is doing too little to achieve a goal agreed in 2010 of limiting warming to below 2 degrees (3.6 Fahrenheit) above pre-industrial times, seen as a threshold for dangerous floods, heatwaves, droughts and rising sea levels.
To get on track, governments may have to turn ever more to technologies for "carbon dioxide removal" (CDR) from the air, ranging from capturing and burying emissions from coal-fired power plants to planting more forests that use carbon to grow.
Most projects for capturing carbon dioxide from power plants are experimental. Among big projects, Saskatchewan Power in Canada is overhauling its Boundary Dam power plant to capture a million tonnes of carbon dioxide a year.
And, if the world overshoots concentrations of greenhouse gases in the atmosphere consistent with the 2C goal, most scenarios for getting back on track "deploy CDR technologies to an extent that net global carbon dioxide emissions become negative" before 2100, it says.