Millions of years ago Our planet has experienced five major extinctions in the four billion year history of life. The first, 450 million years ago, occurred
shortly after the evolution of the first land-based plants and 100 million years after the Cambrian Explosion. The second
extinction occurred 350 million years ago, causing the formation of coal forests. Next Earth experienced two mass extinctions
during the Triassic period, between 250 and 200 million years ago. The fifth mass extinction occurred 65 million years ago,
ending the reptilian dominance of the Earth. According to Richard Leakey, the sixth mass extinction is happening right now.
Leakey suggests that we, the human race, are the cause. Each year, at our hand, approximately 50,000 species vanish from Earth.
He believes that man is destroying Earth at a rate comparable with the impact of a giant asteroid. Leakey's statistics indicate
that 50% of Earth's species will become extinct within the next 100 years
Assuming Leakey's hypothesis of a sixth mass extinction to be true, how will we expect the model to change?