This is the first agriculture model for students in Project Guts, Fall 2015. This model sets the terrain color and creates a push button to show the 3d view (using take camera). Students will add a sun to emit solar radiation (yellow circles) which travel down to the Earth's surface. Once they collide with the Earth's surface, some of the radiation is reflected while another portion is absorbed and then emitted as infra-red radiation (referred to as "heat" here, represented by red circles).
Extension: make the reflected energy and heat agents rise up into the sky, then get deleted.