Mocking people who deny climate change by pointing to gravity: not a good idea. Gravity isn't accepted because a lot of scientists say so, like with climate change. It's accepted because everyone has immediate personal experience with it. Climate change on the other hand cannot be established with simple experiments, even pointing at higher temperatures is insufficient since what's meant with climate change is about humans being responsible for a changing climate rather than more high temperatures being a natural occurrence. That requires a lot of difficult data gathering and analysis and therefore in effect trust in scientists whereas gravity requires no such trust.