Quote -- scary!: The new study finds that the Greenland ice melt 400,000 years ago caused at least 5 feet of sea level rise, but perhaps as much as 20 feet. “These findings raise additional concern that we could be coming perilously close to the threshold for collapse of the Greenland ice sheet and massive additional sea level rise of a meter or more,” says University of Pennsylvania climate scientist Michael Mann, who wasn’t involved in the research. Today, less than a foot of global sea level rise is already causing serious flooding and storm surge problems for coastal cities—and that’s without the potential for an additional 20 feet.

This article is particularly interesting as it provides insight into the history of climate change and ice conditions in Greenland. Seeing that the Greenland ice sheet had melted some 400,000 years ago provides a more complete picture of the natural climate change that has occurred over hundreds of thousands of years.

Climate change is a relevant and important topic for today's global society to understand. The study of the past can provide valuable guidance on how the Earth has reacted to natural and human changes. This information can help us to face the challenges of climate change today and in the future.

However, it is important to remember that this study also shows that climate change occurred naturally before any human activities that contributed to today's global warming. Therefore, as human beings, we must also take responsibility to reduce our negative impact on the environment and take action to protect our planet in a sustainable manner.