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Annual CO 2e emissions<br />

Increasingly used<br />

ADAM/Hulme (2009/10)<br />

van Vurren et al (2010)<br />

What are current emissions?<br />

What growth rate till the peak?<br />

When do emissions peak?<br />

What reductions are ‘viable’?<br />

What emissions floor?<br />

Are negative emissions assumed?<br />

One in three major IAM-based scenarios (Clarke et al 2009)<br />

Ubiquitous in low carbon scenarios with no-or-little overshoot<br />

2000 2020 2040 2060 2080 2100

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