Energy consumers in Britain would be affected by several of the suggested ways to meet a higher target, including the use of low-carbon electricity for heating and a programme to promote and maintain energy efficiency.
The IPPR's co-director Lisa Harker said: "For this to be achieved we would need a radical shift in the pace and scale of investment in low carbon technologies."
The latest findings on climate change have come after a report by the UK Energy Research Centre claimed many energy users could actually be cancelling out their efforts to become more energy efficient.
An example of a so-called "rebound effect" is when a family buys a fuel-efficient car but uses it more often than its previous vehicle.
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