There is no doubt that humankind dreams of making Mars our second home. However, sending people there will require all the skills, courage and (intelligent) of the human race. While the Moon can be reached within days, it would take months to reach Mars, (travel) through dangerous solar radiation. And even if the first settlers do reach Mars safely, staying alive will be daily challenge, but as proved by the Biosphere experiment, not impossible.
As early as the 1980s, scientists were building Biosphere 2 in the Arizona desert. It consisted of a closed space people, animals and plants could live together. The "closed" concept meant that the space was designed (function) with its own oxygen, food and water, needing nothing from the outside world. the two-year experiment was not a success, it did provide us with a better understanding of how humans might be able to live on another planet. More recently, scientists (succeed) in growing a variety of plants in an environment similar to that on Mars. That (definite) is a big step forward.
For now, human settlement of Mars is still (decade) away. In the meantime, scientific research shows that the planet Earth is getting (warm). This change is having a terrible effect on the biosphere.
