Our world has many problems caused by human actions. So we should care or help our planet from these problem . some problem in the world ,like pollute the air (we use fossil fuel so we must use non renewable resources carefully) , global warming made weather is getting more extreme. this is problem for people , animals and plant . so scientists investigating to making clean electricity for reduce global warming and pollute . we can make electricity by solar energy to heat water in homes ,offices and another
this one problem