Traveling the great Panspermia trade routes, ensconced on meteorites, it is predictable that everywhere it lands and there is an opening for it to establish a foothold, it will. Life has now been found not only two miles down in the frozen Antarctic ice, but clinging to the volcanic vents on the floor of the ocean and perhaps most impressively, in the hearts of nuclear reactors. So, a group of scientists suggest that life have started on Mars, crossed through space to Earth and triggered the Cambrian explosion of life here on Earth. His seminal paper on the greenhouse effect first advanced the concept that by burning fossil fuels, and thus injecting large amounts of carbon dioxide into the atmosphere, humanity was changing the thermal balance of the Earth and producing greenhouse warming. This brings us back to a sobering reality.
Earth is in trouble.
Mars teaches us that we must.