Place four items on a table (each item must represent an element). The four elements are air, fire, water and earth. Place your items on you altar (or table) then light candles/incense (if you're using them) and just sit quietly for 5 or 10 minutes.
Think of our beautiful world and how you can help it. If you want to you can sit quietly for longer. Once you feel you're done stop. If you are using candles/incense keep them lit until they burn down( if you go to bed light them out just for safety)