This is an EvO strategy, it will not work well in EvC or EvE. This also works best in medium maps, desert is long enough. Note this is targeted at newer elemental players, around 1700 - 1800+. CHair abbreviation is originally from pumu. It stands for Charrog + air.
This strategy has also been posted at the stick empires wiki (it's at the bottom in the elemental section), I just added some more stuff here. http://stickempires-rts.wikia.com/wiki/Metagame_Strategies
This strategy can be morphed from the three earth start or an air start. With the air start you can pick off an archer or a miner, with the three earth start you will be more defensive but have more eco.
For earth tips, I highly recommend you to click here, as I don't feel the need to explain it : http://forums.stickpage.com/showthread.php?86495-Earth-tips Reading the replies will help as well.
Using the earth start, if the opponent goes with an archer start, attack the archer and keep getting earths. After your earth starts getting wounded use your other earth (which should be there by now) to tank for you wounded earth, which you should turn into a miner. Keep repeating this process until your opponent inevitably overwhelms you. With the technique shown above you should have a good economy, use this money to buy a castle air. With your earths as tank, this should keep archers away.
After he goes away, try to build around 2-3 airs. Keep scouting the middle, and build a Charrog ASAP. He will most likely be building a lot of archers and swords. Once you attack, make sure you have your airs target the archers and ignore all melee units. 3 bolts from an air will kill an archer. Keep buying airs for firepower and fires for Charrogs. Start getting waters and buy the healing upgrade.
Pursue his army and kill as many miners and archers as you can.
Pull your Charrog back once it gets too wounded, buy any upgrades you need for support units eg. tornado, meteors and more Charrogs. Keep repeating the process and don't let your opponent build walls. You can mix in any support units, you can macro more waters for Cycloids, or macro fires for infernos.