NOVA Season 42 Episode 20 Synopsis

Sharply rising carbon emissions are entering Earth's seas at a staggering rate, raising their acidity. Learn how scientists are researching the effects and looking for solutions.

NOVA Season 42 Episodes...

• s42e01 - Vaccines Calling the Shots
• s42e02 - Rise of the Hackers
• s42e03 - Why Planes Vanish
• s42e04 - Surviving Ebola
• s42e05 - Ben Franklin's Balloons
• s42e06 - First Air War
• s42e07 - Bigger Than T. rex
• s42e08 - Emperor's Ghost Army
• s42e09 - Killer Landslides
• s42e10 - First Man on the Moon
• s42e11 - Big Bang Machine
• s42e12 - Sunken Ship Rescue
• s42e13 - Sinkholes-Buried Alive
• s42e14 - Colosseum - Roman Death Trap
• s42e15 - Petra - Lost City of Stone
• s42e16 - Hagia Sophia: Istanbul's Ancient Mystery
• s42e17 - The Great Math Mystery
• s42e18 - Invisible Universe Revealed
• s42e19 - Nazi Attack on America
• s42e20 - Lethal Seas
• s42e21 - Chasing Pluto
• s42e22 - Nuclear Meltdown Disaster

NOVA Show Summary

Seen in more than 100 countries, NOVA is the most watched science based television series in the world and the most watched documentary series on PBS. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over.