According to his responses to the New York Times, Bennet supports a public option.
Bennet is pro-choice.
Bennet's website has a climate change plan that references the IPCC 2050 net-zero emissions target but does not mention the 50% reduction target by 2030. His plan does however state that we should try to reduce emissions as much as possible by 2030. He does not refer to a Green New Deal at all.
According to questions from 538, Bennet does support marijuana legalization.
According to his website he supports campaign finance reform but has not stated if he supports breaking up monopolies.