The result is one chance in 3.2 billion. To assess this factor requires that a scientist understand the cause of the Earth's geomagnetic field. When this factor is added into the odds, the chance slims down to about one chance in three or four quintillion. Understanding the recent organization of the Solar System, the Earth has not been greened forever, but only over the last age, since capture by the Sun, not over 100,000 years ago, and likely less. Moreover, there is no certainty it will greened forever into the future.
Design wins every inning.
One can't believe impossible things. When I was your age, I always did it for half an hour a day. Why, sometimes I've believed as many as six impossible things before breakfast. Geomagnetically speaking, it is the same story. Nevertheless our planet has been greened and stocked with a mega-circus filled with strange animals and magnificent flora.