OU students can use the various subscription databases for the different national laws - but there are also some freely available websites that are monitoring developments and maintain databases. They are not going to be as uptodate as the national sources - and any translations into English they give are probably unofficial - but can be useful starting points for academic research.
The Yearbook of International Environmental Law - available online for holders of an Oxford SSO, and in print at Internat 300 Y50 has a Country/ Report section which summarizes key developments over the past year.
The international comparative legal guide to environment & climate change law an annual is at Ref Law Dir G56
To do a successful subject search on SOLO, simply add the name of the foreign jurisdiction you are interested in after key subject terms such as Environmental law eg Environmental law - India
Nature conservation -- Law and legislation
Conservation of natural resources -- Law and legislation
If you use "international encyclopaedia environmental" + jurisdiction name you will pick up the individual monographs derived from Kluwer's International encyclopaedia of laws, which are brief overviews for the practitioner, rather than theory/policy.