

Genuinely there needs to be a fee that companies must pay for the pollution they create, with it written into law that they can’t palm the cost off on their customers.
We need to move shipping away from the ‘barely more refined than crude oil’ fuels they use
We need to ensure protection of the oceans by making it so that outflowing waste from industry never reaches the watercourse in the first place.
Single use plastics need to be removed from the supply chain (alternatively changed at the production level so they’re made from plant cellulose or a material that doesn’t break down into PFOAS or microplastics)
We also need to block petrochemical companies from lobbying or interfering with politics, and prevent them from funding smear campaigns against renewable energy sources
https://en.m.wikipedia.org/wiki/Curie_temperature I doubt they’re using magnets, especially considering how hot they have to get to lose their magnetism as you suggest.
Most thermostats in electronics such as kettles and cookers use a bi-metallic strip inside, where the two metal layers expand at different rates. The contacts in the switch are physically pulled apart by the strip bending when the desired temperature is reached. https://en.m.wikipedia.org/wiki/Bimetallic_strip