Climate change is widely recognised as one of the major forces shaping the future. Climate impacts illustrate in stark clarity how human actions fundamentally affect the basic physical processes of the planet with vast and, in the worst cases, disastrous consequences for communities around the world. Given these profound impacts, climate change is increasingly treated as a security risk. As a changing climate is causing and will continue to cause diverse impacts across the globe, the associated security challenges are multifaceted. They involve human, community, state, and international security risks, and will require responses across all levels of decision-making, from the local to international.

Rising concentrations of heat-trapping greenhouse gases in the atmosphere are reshaping the world from the top down, according to a special report on the world’s oceans and frozen regions from the United Nations climate panel.

This summer, United Nations agencies published three reports that offer a sobering assessment of the current state of international security and development, focusing on multidimensional poverty, hunger, and forcible displacement. As some countries succeed in steadily improving the living conditions of their most vulnerable populations, others have struggled to overcome sustained episodes of political instability and violent conflict. Together, the reports affirm the urgency with which the international community must reorient its policy priorities and take action to achieve the Sustainable Development Goals (SDGs) by 2030.

When the Fourth Session of the UN Environment Assembly (UNEA-4) takes place in Nairobi starting March 11, governments, international organizations, and civil society organizations will discuss issues on the theme of innovative solutions for environmental challenges and sustainable consumption and production with over 30 draft resolutions submitted for discussion. With few international forums where the environmental dimensions of conflict can be properly discussed, we were optimistic about the past resolutions tackling this topic.

On 25 January 2019, the UN Security Council held an open debate to discuss the security implications of climate-related disaster events. The meeting, initiated by the Dominican Republic, underscored the global nature of climate-related disasters. Most speakers highlighted the need for better climate risk management as an important contribution to safeguarding international peace and security. The debate marks the beginning of a year in which climate security ranks high on the UN’s agenda.

With the tumultuous NATO summit and a simmering trade war dominating stateside headlines last month, the European Union’s progress on climate-security connections has received little attention. After the U.S. government rolled back its significant efforts in early 2017, the EU and its leading members—particularly Sweden and Germany—picked up the ball. Three significant events herald what could be the start of a new era of climate-security policymaking—one under European leadership.

As the national security ramifications of climate change grow more pronounced, climate manipulation technologies, known as geoengineering, will become more attractive as a method of staving off climate-related security emergencies.  However, geoengineering technologies could disrupt the global ecological status quo, and could pose a potentially coercive (and very serious) threat to peace. Is it possible to obtain the potential benefits of these game-changing technologies, while avoiding spurring violence and conflict?  In a recent article in Strategic Studies Quarterly, we argue that just war theory—which defines the concepts of “right” and “wrong” in warfare—could provide ethical standards for security decision-makers as they consider whether or how geoengineering should be used to address the climate challenge.