Project Greensand's first carbon storage site in the North Sea (Credit: Project Greensand)

Carbon dioxide (CO2), released from burning fossil fuels like oil and coal, is a big contributor to global warming and climate change. Over the years, scientists have come up with several creative ideas to capture the harmful gas. However, implementing them on a large scale has proved elusive. But that may change with Denmark's new, bold initiative, Project Greensand. It involves collecting CO2 before it enters the atmosphere and burying it under the North Sea.