March 20, 2017 — At the COP 21 climate change convention in Paris at the end of 2015, leaders from 194 nations agreed to pursue actions that will cut greenhouse gas emissions enough to keep global warming within 1.5 °C (2.7 °F) above pre-industrial conditions. Meeting this goal will avoid continued and increasing harm to people and ecosystems around the world caused by a changing climate, and it is also a great opportunity to turn the world into a place that embodies our collective and pluralistic values for the future. Nevertheless, there remains a notable gap between current trajectories of global GHG emissions and the reductions necessary to see COP 21’s goals realized.
Numerous technological and economic strategies for bridging that gap are currently being discussed, including transitions to renewable energy and/or nuclear power, carbon capture and storage, and cap and trade. However, many overlook the fundamental social issues that drive climate change: overconsumption, poverty, industrial agriculture and population growth. As such, even if these strategies succeed in mitigating CO2 emissions — renewable energies, for instance, seem to have achieved irreversible momentum — they leave unaddressed a second gap, a sustainability gap, in that they allow issues of ecological overshoot and social injustice to persist. We argue that there is an opportunity to reverse climate change by attending to these sustainability issues, but it requires that we reject the convenience of technological optimism and put aside our fears of the world’s “big” social problems.
In 2004, Stephen Pacala and Robert Socolow wrote in Science that it is possible to address climate change by breaking the larger problem of CO2 emissions down into a series of more manageable “wedges.” They offer 15 different solutions based on existing technology, including nuclear energy, coal carbon capture and storage, energy efficiency, and increased adoption of conservation tillage, for mitigating climate change one wedge at a time. Their pragmatic approach to the problem has been popularly received, as evidenced by the thousands of citations that the paper has received. However, their approach can also be critiqued for glossing over the immense costs involved and for its piecemeal and top-down nature. In other words, they assume that this complex global environmental problem can be fixed with a handful of standardized solutions.
Climate change is just one of many related sustainability problems that the world faces. In addition to rising atmospheric CO2, we are approaching or have already exceeded multiple other planetary boundaries — such as fresh water, nitrogen, phosphorus and biodiversity loss — that CO2-mitigating technologies cannot solve. Solving climate change on its own would require immense investments but leave too many other problems unaddressed. That is not to say that these technological innovations are irrelevant; Pacala and Socolow’s desire to break down the challenge into manageable pieces is both valid and appreciable. What’s missing from their assessment is the fact that the world is a complex system, and systemic problems require systemic solutions.
