For years, scientists who wanted to colonize Mars have proposed the idea of terraforming, where extensive groundwork on the red planet releases carbon dioxide into its surface and heats the planet sufficiently to pick up liquid water and make the conditions suitable
The idea has also led SpaceX to send BFRs and make the Red Planet hospitable, but only recently has a new study revealed that conditions on Mars and our current technical knowledge of how to make the situation less than ideal for terraforming, at least not right now? 
Scientists have long been aware of the presence of carbon dioxide on Mars. It is present in the atmosphere of the red planet, but the pressure of that atmosphere is not even one percent of the earth's atmosphere – something that could never hold water in a liquid state.
This is where the idea of terraforming came in, with so many settlements that CO2 and other volatile substances from the surface of the planet could thicken its atmosphere to bring the greenhouse effect into play and heat the planet.
"Carbon dioxide (CO2) and water vapor (H2O) are the only greenhouse gases likely to be present on Mars in sufficient quantities to allow significant warming of the greenhouse effect," said Bruce Jakosky of the University of Colorado NASA opinion.
Based on data from 20 years of space observation, Jakosky and his colleagues analyzed history of the current situation of carbon dioxide and water vapor on the red planet. This, and the history of the Martian atmosphere lost to space, led them to believe that there is not enough CO2 to warm up Mars.
Mars is farther from the Sun, which means that scientists must make their atmospheric pressure Least similar to Earth, if not more. There is considerable water ice on the planet to form steam, but this can not work without initial warming of greenhouse gases.
While other chlorofluorocarbons or other fluorine-based heat capture compounds do not work in the long run and produce large scale, CO2 is not readily available. The best source of gas, as the researchers have described, is polar icecaps.
However, according to the study, even if we succeed in using thermonuclear explosions or another technique to extract CO2 from ice caps, the atmospheric pressure from the planet would only go up to 1.2 percent of the Earth.
The best Mars, according to their analysis, could provide nearly 7 percent of what is needed to make the conditions hospitable. This could be achieved through the use of energy- and resource-intensive techniques to extract carbon from sources such as dust particles in marine soil and subterranean mineral deposits.
"Our results indicate that there is not enough CO2 on Mars to reach significant greenhouse warming should the gas reach the atmosphere," added Jakosky. "In addition, most of the CO2 gas is inaccessible and could not easily be mobilized, and as a result terraforming Mars is not possible with today's technology."
While the study has important implications for the colonization of the red planet the team involved in the work requires the possibility that atmospheric pressure could reach the atmosphere when CO2 is extracted from deposits buried deep in the Martian crust. Unfortunately, there is currently no detailed information on the extent of these deposits or how such work could be done without consuming too much energy, as is the case with current technologies.
The study, entitled "Inventory of CO2 available for Terraforming Mars" was published on July 30 in the journal Nature Astronomy.