The Climate Trump Card: A Tale of Two Futures

US President Donald Trump’s assertion that the UN’s climate projection, RCP 8.5, was “WRONG! WRONG! WRONG!” sparked a conversation about the validity of this extreme scenario. However, behind Trump’s inflammatory rhetoric lies a story of how climate action has already begun to shift the trajectory of global warming.

The notion that RCP 8.5, once considered a worst-case scenario, is now deemed implausible due to the emergence of climate policy and the rapid adoption of renewable energy. Climate scientists have long criticized this extreme projection for its “dramatic overestimation” of future coal use.

A Scenario Reborn

RCP 8.5 was first introduced in 2011 as one of several Representative Concentration Pathways (RCPs) that scientists used to project future climate change scenarios. These RCPs were designed to depict various possible futures, depending on human decisions about emissions reduction and fossil fuel use. The scenario’s origins are worth examining: it was created during a period when global emissions had skyrocketed by 30% in just over a decade.

Climate scientist Zeke Hausfather notes that the worst-case projection has been subject to criticism from climate scientists and skeptics alike for its dramatic overestimation of future coal use. However, RCP 8.5 was never intended as an absolute certainty but rather as one possible outcome.

A New Era of Climate Policy

A recent review paper deemed RCP 8.5 implausible, marking a significant shift in climate science. By acknowledging the impact of climate policy and renewable energy on emissions trends, scientists are now better equipped to project more realistic scenarios. Hausfather describes this re-centring as “a welcome development,” reflecting the world’s changed landscape.

However, abandoning outdated scenarios comes with both good news and bad. While the worst-case scenario may not be as dire as previously thought, the best-case scenario is still out of reach. Global temperatures continue to rise, and the world remains on a trajectory to see an average temperature increase of 2.5 to 3 C in the next few decades.

A Trumpian Future?

The demise of RCP 8.5 raises questions about the possibility of even more extreme scenarios. Hausfather suggests that there is still one scenario tied to where the world is headed under policies in place today, which envisions a future with rolled-back climate progress and ramped-up fossil fuel use – eerily reminiscent of Trump’s vision for the US.

The irony lies not only in Trump’s mischaracterization of RCP 8.5 but also in his administration’s actions, which have contributed to a world where such extreme scenarios are still possible. As the international community continues to grapple with climate change, it’s essential to consider what this means for our collective future.

The Road Ahead

The story of RCP 8.5 serves as a reminder that climate projections are not fixed or absolute but rather dynamic and influenced by human decisions. While progress has been made in reducing emissions, the trajectory of global warming remains uncertain. As we move forward, it’s crucial to acknowledge both the good news – that climate action can alter worst-case scenarios – and the bad: that the best-case scenario is still out of reach.

Trump’s reaction to RCP 8.5 reveals more about his administration’s stance on climate change than anything else. As we gaze into the future, it’s essential to consider not only what this means for our planet but also for the kind of world we want to create – one where science and policy converge to mitigate global warming, or one where Trumpian visions of a fossil-fuel-driven future become reality. The choice is ours.