"What a long way we've come! Sponge is 10 years old next year and we now have over 3,000 professional members and still not enough skilled people in the sector to cope with the mainstream demand.

"My personal journey has taken me from the position of being a junior consultant in a boutique sustainability consultancy to UK MD of a specialist boutique consultancy which has transformed itself into one of largest climate-change services businesses in the world. The success of both these organisations is a sign of the times and demonstrates the high demand for sustainable change."

Sonny Masero, Founding, SPONGE Sustainability Network