Earth Token is listed by CoinmarketCap as having a ROI of -99.65% and current market cap of $34k USD. Basically they are dead. As with many of the companies mentioned in the videos so far...they are already gone. The space is changing too rapidly.

Etherscan.io shows that they has interest from ~15,000+ people who wanted to join in the ICO, but looks like it never went off. One of the co-founders has already died and their blog and website are bereft of updates.