I am not far away from finishing a PhD in molecular toxicology. However, with time I have gotten more and more interested in topics such as renewable energy, environmental/climate science and engineering. My education so far is not completely alien to environmental science, but my background heavily oriented towards molecular biology so I lack basic knowledge about things relating to renewables, climate systems and field work. Another big factor is that non-academic jobs in my current field do not interest me at all.
What would be the best route for me if I wanted to move towards these fields? Get a new master's or try to land post-docs incrementally closer to where I want to be?