Any ideas? details below...?

Question:

Any ideas? details below...?

The topic is "Global Warming", and I need to illustrate it (on of course the most effective way) on a white illustration board using only the basic tools of the trade: crayons, marker, oil pastel and pencil.
So how do I illustrate it?
A detailed suggestion will be much appreciated... Thanks

Best Answer - Chosen by Asker: It will be a multi-image illustration.
The sun with its rays touching icebergs and increase of water level, evaporation of water - small drops of water flying to the sun and forming a cloud, the cloud going to populated areas throwing out stream of water or strong snowfall....