Last week, in an unprecedented show of coordination to address the connections between climate change and security, the Biden-Harris Administration released four reports—which taken together, mark significant progress in the effort to center climate change in U.S. national security and foreign policy. The documents—which fulfill key requirements laid out in two Executive Orders issued by President Biden in the early days of his administration—describe how climate change will increasingly heighten instability and influence the United States’ strategic interests, including shaping competition with other great powers—most significantly, China.

A new Global Fragility Strategy, released late last year by the U.S. Department of State, signals a growing awareness of the role that environmental issues play in fragility, conflict, and peace. According to the State Department’s Office of Foreign Assistance, in the last five years alone, “the U.S. government has spent $30 billion in 15 of the most fragile countries in the world.” These “large-scale U.S. stabilization efforts after 9/11 have cost billions of dollars but failed to produce intended results,” writes Devex’s Teresa Welsh. As a result, Congress passed into law in 2019 the Global Fragility Act, legislation that directed the Department of State to lead the development of a new 10-year Global Fragility Strategy that sets out a new U.S approach to conflict prevention and stabilization in fragile contexts.

Climate change will upend the 21^st century world order. It will redefine how we live and work, and change the systems of production, trade, economics, and finance. Even now, in the midst of a global pandemic, it is clear that climate change will be the defining issue of this century. In fact, COVID-19 has only underscored the inadequacy of our responses to global crises and heightened the urgency of this call to action. 21^st century diplomacy will have to raise climate ambition, shape the transformative systems change needed, and promote and facilitate new modes of multilateral collaboration.

Evidence that extreme weather, water, and climate events pose critical security risks to the U.S. homeland, national security, and global stability has been mounting in recent years. From destabilizing droughts in Africa to devastating hurricanes and flooding in the United States, we are clearly seeing an increase in not only the frequency and severity of these events, but also their physical, social, and economic impacts.

The new year promises some big changes for the field of environmental security—and some big moves for the Environmental Change and Security Program (ECSP). As we say hello to 2018, we wave goodbye to Roger-Mark De Souza, and welcome him to our team of advisors and fellows. And I’m excited (if a bit daunted) to step into his shoes as our Acting Director and tackle the challenges to come.

Earlier this month 46 House Republicans voted with Democrats to protect an amendment in the current National Defense Authorization Act that acknowledges that “climate change is a direct threat to the national security of the United States” and requires the secretary of defense to provide “a report on the vulnerability to military installations and combatant command requirements resulting from climate change over the next 20 years.”