Thus, the central objection raised against the human settlement and terraforming of Mars: Such projects may be technologically feasible, but there is… - Robert Zubrin

It is clear that for Gore, global warming agitation is not really about climate change at all. Put simply, it's not about weather, it's about power. The movement is everything, the goal is nothing. It's not about curbing CO2 emissions; it's about creating a mob – a mass cult whose legions empower its shamans, and whose systematic anti-human ideology serves as a basis for reorganizing society along totalitarian lines.

THE FOUNDING PROPHET of modern antihumanism was Thomas Malthus (1766–1834). For three decades a professor at the British East India Company's East India College, Malthus was a political economist who famously argued that human reproduction always outruns available resources. This doctrine served to rationalize the starvation of millions caused by his employer's policy of brutal oppression of the peasants of the Indian subcontinent. The British Empire's colonial helots, however, were not Malthus's only targets. Rather, his Essay on the Principle of Population (first published in 1798 and later expanded in numerous further editions) was initially penned as a direct attack on such Enlightenment revolutionaries as William Godwin and the Marquis de Condorcet, who advanced the notion that human liberty, expanding knowledge, and technological progress could ultimately make possible a decent life for all mankind. Malthus prescribed specific policies to keep population down by raising the death rate:

There is as much water per square mile on Mars as there is on the continents of our home world.