GAIA operates with the support of a 6-person Global Advisory Hub (Hub), which is responsible for helping to develop the overall strategy and direction of the alliance while providing input on regional needs and issues. In consultation with GAIA’s members and the Regional Advisory Committes, the new Hub representatives are nominated and appointed from each region of the world. GAIA’s priorities are also developed at larger member gatherings, such as regional and global GAIA meetings.


Elisabeth Grimberg, co-founded the Pólis Institute in 1987. Since then, she has been in a coordination role three times for 14 years, and has coordinated the waste area since 1990. She took the initiative to organize with other activists and partners, and created networks to fight for a Waste National Policy in Brazil, and also to create an alternative to incineration called National Coalition against incineration. More recently Elisabeth co-promoted the Zero Waste Alliance Brazil. She Became a GAIA member in 2008.

Elizabeth Crowe,  has worked as a non-profit environmental health and justice organizer and director at the local, state, national and international levels for 25 years. Her experience as a grassroots and policy coordinator on military toxics (with the Chemical Weapons Working Group), incineration, and other issues led to her engagement as a founding member of GAIA. Most recently, she served as a Co-Director of Coming Clean, a national environmental health and justice collaborative focused on building grassroots power, and partnerships for chemical industry reform.

Huub Scheele, graduated in 1989 as an environmental engineer from Wageningen Agricultural University in the Netherlands. He specialized in human health, soil and water pollution and hydro-geology. During his studies he became the founder, and leader of a youth environmental organization. After working at the Amsterdam University, the Estonian Ministry of the Environment, and the Dutch Ministry for Development Coordination, Huub joined Both ENDS, an environment and development service based in Amsterdam. He was involved in setting up the formal Zero Waste Network and is a member of the Board of Directors of Zero Waste Europe.

Sonia Mendoza, is chairman and founding member of Mother Earth Foundation in the Philippines, she is a member of the Board of Trustees of GAIA Asia Pacific, the Ecowaste Coalition Philippines, and the Board of Directors of the Zero Waste International Alliance (ZWIA). She serves as a resource person on Ecological Solid Waste Management/Zero Waste to local government units (LGUs), schools, business offices, church organizations, and civic organizations and in congressional hearings on solid waste management and environment concerns. She has helped establish zero waste model communities in the Philippines. 

Xavier Sun, is a Zero Waste Campaigner with Wild at Heart Legal Defense Association in Taiwan. He has focused on zero waste and plastic pollution for the last ten years. Prior to joining Wild at Heart, Xavier was the Waste Management Researcher for Taiwan Watch Institute. He holds a PhD in Biochemistry and Molecular Biology.

Soukaïna Aziz El Idrissi, is an artist, designer and co-founder of the association Zero Zbel. She uses plastic waste in her artistic work, exploring the possibilities of this material in order to question its value and its perception. After two years of collaboration with Mamoun Ghallab, and nearly 10 years of commitment against waste, Soukaïna co-founded Zero Zbel. This Moroccan association is now a reference for youth awareness and environment protection.