More commonly, teacher professional development on ESD has been undertaken by CSOs (such as the Jamaica Environmental Trust (JET)’s School Environment Programme in Jamaica) or multilateral organisations (such as UNESCO). There is a missed opportunity for better co-operation in this area, since in many cases CSOs are providing ESD training to public sector teachers - which should arguably be the responsibility of MoEs - but without full MoE support or formal endorsement of the work. For example, while many countries have a credentialing system that requires teacher professional development, there is no evidence of CSO-delivered training on ESD being credited in any of these systems, even when the CSOs have sought this out.