US Secretary of State Marco Rubio called Donald Trump the “Peacemaker-in-Chief” on 26 August 2025.

But Trump shed the cloak of peacemaker and revealed his true nature when he joined Benjamin Netanyahu’s illegal war against Iran on 28 February 2026.

Iran’s response was to close the Strait of Hormuz through which around 20% of the world’s liquified natural gas and seaborne oil had flowed, bringing sharp increases in fuel prices and turbulence in stock markets.

Several people, including former Russian president Dmitry Medvedev, have warned that this could lead to World War 3 if Trump continues to pursue this war.

But even while pretending to be a peacemaker, Trump had declared another and equally dangerous war.

During his first few hours in office in January 2025 he once again withdrew the US from the Paris Climate Agreement. Since then he has taken more steps to stop US scientists doing any work on climate change, which Trump described as “the greatest con job ever perpetrated on the world” when he spoke to the UN General Assembly.

In January 2026 he withdrew the US from the UN Framework Convention on Climate Change (UNFCCC), the Intergovernmental Panel on Climate Change (IPCC) and the Green Climate Fund (GCF). In February the U.S. Environmental Protection Agency (EPA) finalized a rule overturning its own “endangerment finding” that the buildup of greenhouse gases in the atmosphere endangered public health and welfare.

Trump has been calling for the ending of two satellite missions that have been crucial in global climate and ecological monitoring over the past decade. His 2026 budget request includes no money for this project. This is part of a larger NASA shift away from climate research.

Failing to stop global warming and switch to environmentally friendly energy sources will lead to more and more extreme weather, instability in financial markets, and potentially lead to wars between nations competing over the same limited supply of fossil fuels.

So which is the worse danger that Trump is bringing to world peace: declaring illegal wars on countries whose governments he does not like, or declaring war on scientists studying climate change?