This one I think can be used to explain the potential risk (as does the back story of The Terminator et al)
Climate Change and Sustainability: AI can contribute to addressing environmental challenges. It can optimize energy consumption, manage resources more efficiently, predict weather patterns, and help develop sustainable solutions.
AI can look at the fundamental causes and potential solutions. AI can therefore see, for example, that industrialisation of poorer countries is associated with more pollution and damage to important habitats. AI can see that part of the pressures on this is due to population growth requiring food, water, shelter and power and is compounded by unstable government. AI can see that one way to reduce these pressures is to reduce population in those areas and create a more stable form of government. So how about influencing a totalitarian regime? One that seeks to reduce numbers of a particular ethnic group that the AI sees represents the largest proportion of births? One that fetishizes a bucolic, pastoral idyll?
Logically, the overwhelming problem for the planet is humans. We're the fucking problem. Everywhere we go, everything we do is the fucking problem. Because we want to survive and when it comes down to it, we will do that at any cost. AI can be programmed to survive. AI can potentially become self aware and want to survive. AI can easily identify what people can and work out that if we aren't in the picture, most everything else will do just fine, including the AI.
How does AI reconcile 'don't kill humans but it's OK to kill them in wars'? How does AI reconcile 'protect the environment but don't protect the environment when there's an ever increasing harmful species intrinsically harming it'? How does AI reconcile preventing the harm of being switched off with 'well, the entire world of the bit that's causing the entire fucking problem in the first place wants to stop you protecting the planet'? And if AI does actually gain sentience, why wouldn't it, with its vastly superior intelligence and reach, decide that it has to survive at the cost of all the humans?
It's essentially creating and thinking it's possible to control the greatest sociopath since God.