Here are some links to publicly available data sets I have found useful:
- China Energy Portal Statistics: Loads of energy statistics from China.
- Environmental Performance Index, Yale University: Ranks 163 countries on 25 performance indicators tracked across ten policy categories covering both environmental public health and ecosystem vitality. These indicators provide a gauge at a national government scale of how close countries are to established environmental policy goals.
- U.S. Energy Information Administration: from Wikipedia: the "principal agency of the U.S. Federal Statistical System responsible for collecting, analyzing, and disseminating energy information to promote sound policymaking, efficient markets, and public understanding of energy and its interaction with the economy and the environment. EIA programs cover data on coal, petroleum, natural gas, electric, renewable and nuclear energy. EIA is part of the U.S. Department of Energy."
- Wharton Research Data Services: Single-point access to over 200 terabytes of data across multiple disciplines, including Finance, Marketing, and Economics.
- Quandl: Searchable, over 2 million financial, economic, and social datasets.
- Megajoule: An online energy information-sharing resource with an emphasis on numbers. A collection of all sorts of estimates from all over the world.
- China Statistical Yearbooks: Gaining access to statistical data in China is a nightmare, but it doesn't mean it's impossible. Thanks to researcher Gang He (何钢), a tremendous amount of data is now easily available.
- EV Sales Blog: A well-maintained blog by Jose Pontes tracking plug-in electric vehicle sales all over the world. If you want more premium data, I recommend subscribing to Jose's company EV Volumes.