Masters in Business Administration programs in Sustainable Business at top business schools like Stanford, Yale, and Columbia normally require a number of years of business experience as an entrance requirement, but there are a few programs that do not have this requirement. For example:
Bard College MBA in Sustainability
The following link provides a full list of graduate programs in environmental policy, science and management.
While environmental law can be studied at most law schools, the following schools have special, concentrated programs in environmental law.