Scientists who venture to the most perilous parts of Antarctica tell us the massive "Doomsday Glacier" is melting at an unprecedented pace. Our carbon emissions are having a potentially catastrophic effect on the world's sea levels, and we are in a race against time to avoid a global average temperature rise of 1.5 degrees Celsius by the year 2025. Entrepreneurs and researchers lead the way with innovative attempts to both reduce and capture CO2, but the fight for our future is not theirs alone.