These are clean energy and new technologies including recycling; rural energy including renewables and biomass; sustainable agriculture including organic cultivation; ecosystem infrastructure and reduced emissions from deforestation, and sustainable cities including green building and transport.

Just be careful what you invest in. Investigate the institutions and technology that are calling themselves "Green", because there is no official standard controlling who can and cannot call themselves "Green". Make sure that they truly are environmentally-oriented and will use money and time invested in them ethically.