As we approach the 100th day of the Trump administration this Saturday, it’s clear that the new president has determined to maintain the fossil fuel regime. In response, hundreds of marches will be held around the country (including in Ithaca), with the main event in Washington, DC. As Bill McKibben notes, “since Trump obviously takes his 100th day seriously, it will be a particularly good day to be around his house reminding him how badly he’s doing.”

The rollback of the Obama administration’s energy and climate policies, which had their own limitations, means that the U.S. will send up to 900 more megatons of greenhouse gases into the atmosphere each year. According to a recent report, that will increase the world’s annual greenhouse gas emissions by almost 2 percent at a time when we need to be making dramatic cuts in these emissions.

Trump’s advisors are divided about whether the U.S. should abandon the Paris Agreement, but even the strongest advocates for not doing so want to renegotiate the terms of the accord. In any event, it certainly appears as if we’re handing over leadership on this critical issue to China and Europe. In terms that Trump might understand, such a failure of leadership will do permanent damage to our nation’s brand. But much more than a marketing blunder is at stake;  the fate of human civilization rests on not going down this road.

The one bright light is that the transition to a clean energy economy seems to have reached a tipping point that will carry it forward regardless of any policy shifts. In particular, despite President Trump’s rhetoric, It’s too late to bring back coal or the associated mining jobs, not just because natural gas has become too cheap for coal to be competitive. The costs of wind and solar have dropped so significantly in the last several years that they, too, have become cheaper than goal. This new reality is apparent in the recent decision of the Kentucky Coal Museum to install solar on its roof as a cost-saving measure. Yes, that’s right: the Kentucky Coal Museum is going solar.

The numbers tell an even more impressive story. As the chart above indicates, renewable energy capacity grew 9.3 percent in 2015, the fifth year in a row that the rate has been above 8 percent. In the first quarter of 2016, renewables made up 99 percent of the new electricity production capacity in the U.S., and from Q1 2015 to Q1 2016 they increased from 14 percent of electricity to 17 percent. In contrast, coal dropped during that same period from 36 percent to 29 percent.

The global growth in solar has been especially explosive. For the first time since 2013, solar outpaced wind in 2016. The primary driver has been the astonishing reduction in the cost of utility-scale solar: it fell 62 percent from 2009 to 2015 and is projected to drop another 57 percent by 2025.

At the same time, renewables have become a key source of new employment around the world. Renewable energy jobs rose by 5 percent in 2015 to 8.1 million and there were an additional 1.3 million jobs in large-scale hydropower. In another sign of the historic transition taking place, the American solar industry now employs more workers than coal: 209,000 compared to about 150,000 jobs.

So we’re moving in the right direction; that’s the good news. The not-so-good news, however, is that we need to move a lot faster and go a lot further. According to the International Renewable Energy Agency (IRENA), we need to double the share of renewables in the world’s energy mix by 2030 to keep global warming below 2°C. Overall, we need to reduce greenhouse gas emissions by 2.6 percent per year on average to meet the Paris target.

Accomplishing this task is not impossible, but it’s going to take a lot of work. And, clearly, we can’t count on the federal government to make it happen; it’s up to us. All the more reason we need to take to the streets on Saturday and make our voices heard.