The health benefits of reducing greenhouse gas emissions may offset a significant portion of the costs of putting those emission-mitigating policies into action, new research suggests.
These so-called health co-benefits accrue sooner than direct benefits, yet net estimates of mitigation policy costs usually ingore their value.
“The main goal of our analysis is to encourage policymakers to think in broader terms when estimating the cost of mitigation programs…”
To provide scientific support for the value of including health benefits in GHG reduction cost analyses, researchers conducted a comprehensive literature search and systematic review of health co-benefits studies.
The team evaluated studies published since 2009 that estimated the health co-benefits of reducing air pollution associated with GHG emissions from energy production and from increasing biking and walking (reducing emissions from transportation), as well as from diet change, which reduced GHG emissions mainly from eating less red meat. The researchers wanted to identify and recommend best practices to inform policy development.
“There can be large health benefits from reducing emissions of methane and nitrous oxide by cutting down on red and processed meat, because this also reduces the risk of chronic diseases like cancer,” says David Cleveland, research professor in the environmental studies program and the geography department at the University of California, Santa Barbara.
“And cutting down fossil fuel combustion not only reduces carbon dioxide, but also reduces emission of particulate matter and ozone, which also reduces disease.”
“The main goal of our analysis is to encourage policymakers to think in broader terms when estimating the cost of mitigation programs, so that they become more fiscally attractive. To get the net costs, you have to subtract the amount saved due to health co-benefits from the total cost of climate mitigation.”
Of the 42 studies included in the analysis, most indicated significant, near-term, local health co-benefits resulting from the mitigation policies investigated. However, study diversity made it impossible to provide overall estimates of the magnitude of benefits that could be incorporated into cost-benefit analyses of specific policies or to compare the relative benefits of policy options.
Cleveland and the study’s other authors note that increasing consistency in modeling choices—including consistent approaches to population projections, health outcomes, scenarios, time slices, and discount rates, as well as closer linkages between policymakers and research scientists in posing research questions—would enhance comparability across policy choices and allow stakeholders to consider potential synergies of baskets of mitigation options.
The research appears in the journal Environmental Research Letters.
Additional researchers who contributed to the work are from the University of Washington.
Source: UC Santa Barbara