The end of 2016 has not been a sunny time for climate activists.

As the Trump administration takes shape, it has become crystal clear that the president-elect's climate change denialism will soon become de facto U.S. policy. And Trump will not only have many options for rolling back the progress President Obama made to curb carbon emissions, he already is putting in place the personnel to do it. Trump's proposed picks include: for head of the EPA, Oklahoma Attorney General Scott Pruitt, who is currently suing the agency; for secretary of the interior, Rep. Ryan Zinke (R-Mont.), who despite his support for protecting public lands, is lukewarm on climate issues; and, for state department secretary — the face of the United States in international climate negotiations — Rex Tillerson, the CEO of ExxonMobil who is locked in a battle with the descendants of the oil company's founder over its role in distorting the evidence of climate change.

Not all of the news is this bleak, however. As the year ends, there are some pockets of optimism:

1. Other nations are not waiting for the U.S.

The international community is not content to wait on a United States that looks increasingly likely to backslide on its climate commitments. China has become more active in projecting its leadership on the issues (for better or worse) and will soon begin to implement a nationwide cap-and-trade system. Canada is paving the way for a national carbon tax. India has inaugurated the world's largest solar power plant and may not build new coal plants after 2022. An auction in Chile in August generated the lowest bid price for solar power ever. From its dedication to phasing out fossil fuels to providing diplomatic momentum for climate talks, South America offers some promise in what looks like an increasingly dark time.

2. U.S. states and cities aren't giving up the fight either.

California Gov. Jerry Brown (D) energized a lot of people with a fiery speech at the American Geophysical Union, declaring his state will pick up where the federal government leaves off: "If Trump turns off the satellites, California will launch its own damn satellite." California has long been a leader on climate issues, creating its own cap-and-trade program and creating a policy environment to allow for the aggressive expansion of renewables. And his state is not alone. States and cities across the country are working under the assumption that climate change is real and policies need to adjust accordingly. Rhode Island just debuted the first offshore wind farm, in what is being billed as yet another example of the declining cost of renewables.

3. Public opinion is on the side of action.

Though Trump is not exactly eager to admit it, he lost the popular vote by an historic margin. While climate change may not have been the driving force behind that rejection, there is a strong foundation of public support for doing something about it. According to Gallup polling, Americans entered the presidential election period more worried about climate change than at any other point in the previous eight years. Seventy-one percent of Americans believe the country should continue to participate in the Paris Agreements, including a majority of Republicans. While a Trump administration could chip away at that level of support, it would be an uphill climb to erase it completely.

4. Even the most fossil fuel-dependent entities are starting to plan for a less-carbon intensive future.

In November, Royal Dutch Shell speculated that the world's demand for oil would peak within the next five to 15 years. In anticipation, Shell is expanding its work in natural gas, biofuels, and hydrogen fuel, lest it lose either market value or its competitive edge from stranded carbon assets (fossil fuels it owns but cannot burn). Even Saudi Arabia, a kingdom built on decades of oil revenue, realizes its future is in diversifying its economy. While it will be a long time before we can judge the success of these reforms, the fact that they are being put forward is noteworthy in of itself.

The state of international climate action faces a period of serious uncertainty beginning in January 2017. It will be a tall order for the rest of the world to counterbalance a U.S. retreat from responsibility — but we're already starting to see that it's possible.