What is the fine-grained topic of the following text: Nokero (short for No Kerosene) was formed in June 2010 by inventor Steve Katsaros to develop safe and environmentally-friendly solar products that eliminate the need for harmful and polluting fuels used for light and heat around the world, and most importantly, are affordable to the communities that need them. Only return the topic.
Nokero's development of affordable, eco-friendly solar products to replace harmful fuels