"Open-access proceedings in environment, energy and earth sciences."
Each volume is comprised of proceedings of a different conference: Vol. 1 (2013) Proceedings of the 16th International Conference on Heavy Metals in the Environment, Vol. 2 (2014) Science and the Future, et cetera
Volume 1 (2013); title from banner (publisher's web site, viewed July 14, 2014)
Volume 388 (2023) (publisher's web site, viewed May 26, 2023)