As a founder of a startup in the green tech area it is fantastic to hear more and more people sharing an environmental motivation about the work they want to do. There are a growing number of motivated startups around with a direct environmental purpose, though they can be harder to find and a slightly different beast from the established tech companies. (Not wanting to plug myself too much but we're currently looking for a motivated developer actually https://lightfi.io/jobs )

There are also a number of environment and social impact accelerators that may be useful for finding companies or pursuing one's own ideas, we started though the EU Climate-KIC program, for example. Increasingly as well there are a number of larger corporates engaging with social impact as a driver (sometimes this can appear a little like green-washing but there are some genuine motivations behind it).

At the moment it does seem more of a growing industry, the people and the companies are there if you can keep that determination to find them. And the more developers showing and looking for a clear sense of that environmental motivation will itself push through a wider change as there is plenty of great and fulfilling work that can be done.