Note that it is often difficult to find the law of other non-Anglophone countries in English. Online translators like Google Translate can help provide a general sense of what the law is about, but one should be careful about relying on such a translation for any other purpose.
Some Latin American countries have enshrined protection of the environment in their constitutions. These include Bolivia, Brazil, Costa Rica, Ecuador, and Peru.
HeinOnline's World Constitutions Illustrated database includes a collection of documents, historical texts, and commentary related to foreign constitutions, organized by country. The database also includes many current English translations of foreign constitutions. Access for UIC Law patrons only.
Foreign Law Guide: Current Sources of Codes and Basic Legislation in Jurisdictions of the World: This title has been a staple in the area of foreign legal research for more than a decade. Included are brief overviews of the legal systems of over 170 jurisdictions, as well as lists of each jurisdiction's codes, court reports, and other significant legal literature. See the subtopic of "Environment & Natural Resources" within each country heading. The Foreign Law Guide is available via the UIC law library page under "Popular Databases".
ECOLEX: The purpose of this website, jointly administered by several international organizations (FAO, IUCN, and UNEP) is to provide the "most comprehensive possible global source of information on environmental law". The site includes a database of national environmental legislation.
World Legal Information Institute (WorldLII): Several non-profit regional legal information initiatives created and now maintain World LII. The site offers legal subject-based links for individual countries. Click on "All Countries" for an alphabetical list.