Nowdays, the ecology of our planet becomes the most important problem.Because polluted ground,naxious air,contaminated water all of this things can kill not only us,our planet too.One of the most important problem is global warming.The water level rices day by day and after few epoch water can cover our planet all.The second problem is polluted ground.If people don't stop threw trash all of this trash can cover our earh.All of this reasons can kill our planet.