廖秀冬一直積極參與推動環境保護嘅工作，包括參加香港好多個民間環保團體，又幫手主持多個國際環保會議。1988年至1992年，做過香港工程師學會環境分部理事。
Liu has been actively involved in promoting environmental protection, including participating in many environmental NGOs in Hong Kong and helping to chair a number of international environmental conferences. From 1988 to 1992, he was a member of the Environmental Division of the Hong Kong Institution of Engineers.