[t43562]

You're mixing euros and dollars which is a bit confusing. That is a very low salary IMO - I'm in the UK and after big efforts to hire people I cannot imagine being able to hire anyone who could write a for-loop for that little!

Nevertheless, lets assume that's a typical salary: you get to choose your energy provider here and you get to choose what food you eat and how you get your transport. You can put insulation in your loft and use less gas by reducing the heat in your by 1 degree. You can use your surplus to choose slightly more expensive green options. That's before you decide to do anything direct such as investing in companies that are doing innovative green things.