Other existential risks include the decline of natural resources (particularly water), human population growth beyond the Earth’s carrying capacity, and nuclear weapons.
The US could only safely use a fraction of its nuclear stockpile without harming Americans through an environmental event called 'nuclear autumn.'
Some of the major events in US-Iran relations highlight the differences between the nations' views, but others presented real opportunities for reconciliation.
Governments fail to imagine how worst-case scenarios can come about – much less plan for them. But there are things we can do.
The US has 50 nuclear bombs stored in Turkey. As tensions rise between the two countries, a look at how they got there and what might happen next.
How policy has shifted back and forth since 1945 over the fine line between nuclear energy and nuclear weapons.
At best, nuking a hurricane will do nothing, and at worst it will spread radioactive fallout around the world.
Nuclear threats are serious – but officials, the media and the public keep a close eye on them. There's less attention to the dangers of cyberattacks, which could cripple key utilities.
With the risk of a nuclear conflict seeming higher than ever, how much do EU citizens really know about nuclear weapons and their use? A new survey provides striking answers.
Now that South Africa no longer ascribes to a nuclear energy future, it is legitimate to consider what to do with its nuclear research facility.
Developing nuclear weapons requires technological and industrial capabilities that Australia simply does not have at the moment. The political will may be lacking, too.
Iran has announced it will breach the limits on uranium enrichment agreed under the 2015 nuclear deal, after the US turned its back on the agreement. What does that mean for Iran's nuclear program?
The British nuclear weapon tests on Kiritimati (or Christmas) Island had profound and lasting cultural consequences for both atomic veterans and local islanders.
The US isn't the only country considering a military response to Iranian aggression.
Iran's leaders are threatening to breach a 2015 agreement that froze their country's nuclear program. What is uranium enrichment, and what would it mean for Iran's ability to build nuclear weapons?
After years of work, the JCPOA nuclear deal could be on its last legs.
North Korea is a major military threat to the US and its Asian allies, but exactly how powerful are its nuclear weapons? An earth scientist explains why it's hard to answer this question.
There is a growing sense that the British authorities would rather forget their weapons testing history.
Bruce Willis saved the Earth with a nuclear weapon in the 1998 film Armageddon, but the law would need to change for him to do it now.
History shows that diplomacy takes time and many incremental steps forward, a diplomacy expert writes.