They sure are. It sounds like this video is examining these things in isolation instead of looking at the wider social effects that also help counter climate change. For example, if you build houses closer together, you'll not only reduce heating and cooling costs, you'll also reduce the monetary and carbon costs of infrastructure, you'll improve the efficiency calculation of public transit, and you'll make bikes more viable. One change with knock on effects that help three different sustainability areas. One change that literally costs negative money and also helps the environment. How did this not make the list??

Also shooting rich people dead only costs a hunting rifle and some bullets, and it prevents hundreds of private jet flights a year.