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\section{Global and National Commitments}  In December, 195 nations negotiated the \textit{Paris Agreement} as part of the U.N. framework convention on climate change. They agreed to peak \href{http://unfccc.int/files/meetings/paris_nov_2015/application/pdf/paris_agreement_english_.pdf}{"greenhouse gas emissions as soon as possible, [\ldots], so as to achieve a balance between anthropogenic emissions by sources and removals by sinks of greenhouse gases in the second half of this century"}. This legalese means that within a child's lifetime any emissions across the globe will not be allowed without a mechanism to suck that much carbon dioxide out of the atmosphere. Each country volunteered its own \href{http://climateactiontracker.org/}{national contribution} towards this goal.  The U.K. has gone further towards emissions reductions than most countries. Our \href{http://www.legislation.gov.uk/ukpga/2008/27/contents}{Climate Change Act} makes it a legal requirement to reduce national emissions by at 2050 by  least 80\% by 2050. of their 1990 levels.  The fifth carbon budget \href{https://www.theccc.org.uk/2016/03/31/the-fifth-carbon-budget-a-balanced-path-to-a-necessary-goal/}{(for 2038-2032)} to take us towards this target has recently been set at \href{http://www.legislation.gov.uk/uksi/2016/785/made}{1,725 MtCO\textsubscript{2}e} - roughly 5 MtCO\textsubscript{2}e per person per year (Fig. \ref{fig:co2e}).