The five winners:<p><i>Mukuru Clean Stoves, Kenya</i>: Stoves are fired by processed biomass made from charcoal, wood and sugarcane instead of solid fuels.<p><i>Kheyti, India</i>: Greenhouse-in-a-Box helps small-hold farmers protect their crops from extreme weather and pests.<p><i>Notpla, United Kingdom</i>: Natural, bio-degradable plastic made out of seaweed. The company made more than one million takeaway food boxes.<p><i>Revive Our Oceans, Australia</i>: A programme that has trained over 60 women in both traditional and digital ocean conservation methods.<p><i>44.01, Oman</i>: Turn carbon dioxide into peridotite, a rock that is found in abundance both in Oman and globally. It offers a low-cost and safe alternative to traditional methods of storing carbon.