Far from being true, we have enough resources to last us for tens of thousands of years. Renewable technologies are also replacing fossil fuels overtime and other emerging techs reduce reliance on various resources.

Things like synthetic food (already developed in labs) can replace reliance on soil.

The whole earth is dying is mostly grass eater bullshit that wants us to go back to stone ages ignoring texhnology. The only real threat is pollution like dumping waste in land fills and oceans, Air pollution etc.

 I'm all for colonising Mars asap just because I am a visionary but I'm also realistic about idiotic claims of terraforming Mars within the next few decades.