All schools and colleges in Delhi, India, were closed for a week due to dangerous levels of smog.
The Lancet published a study that found pollution contributes to 1 in 6 deaths worldwide.
Astronomers witnessed the first neutron star collision.
Large pieces of plastic polystyrene were found in the middle of the Arctic Ocean.
A Jellyfish was discovered and became the first-known animal that sleeps and doesn’t have a brain.
A century-old fruit cake was discovered in Antarctica that was ''almost edible.”
The World Health Organization estimated that Yemen had over 200,000 cases of cholera.
A large landslide triggered a Tsunami in Nuugaatsiaq, Greenland, damaging several villages.
US Geological Survey issued a statement revealing that 39 Montana glaciers have reduced in size from 39 to 85 percent in the last 50 years.
An orbital-class rocket was successfully reused for the first time.
A five-day pollution red alert was declared in Beijing and 21 other Chinese cities.
An international research team published their discovery of 1,500 new viruses that were in invertebrates in Australia and China.
New Delhi air pollution was declared a public emergency, causing the city to close many schools and construction sites.
The Paris Climate Change Agreement went into force.
Astronomers announced the discovery of an Earth-like planet named Proxima b.
Scientists discovered the oldest living Greenland Shark, with an estimated age of 392 years old.
Authorities blamed climate change for an Anthrax outbreak in the Arctic Circle of Russia.
Harambe the Gorilla was shot to death inside his enclosure in the Cincinnati Zoo and Botanical Garden.
The Paris Agreement was opened for signatures.
Aaron Carpenter swam with dolphins for the first time.
Researchers announced that gravitational waves had been discovered.
A category five blizzard occurred in the Mid-Atlantic and North East US, which covered the area in 3 feet of snow.
The Ebola epidemic in Guinea was declared by The World Health Organization.
The mayor of Flint, Michigan, declared a state of emergency over contaminated water.
The World Health Organization ranked Tuberculosis as deadly as HIV in its list of the world's most deadly diseases.
The latter of two total lunar eclipses was seen from the Americas.
Schools shut down in Singapore due to air pollution from farming practices in Indonesia.
Nature magazine announced that more than 3 million people die yearly from air pollution.
The world's most amazing face transplant took place.
Former President Jimmy Carter had a lesion removed from his liver.
President Barack Obama announced his Clean Power Plan to take action on climate change.
NASA announced they had found 'Earth's bigger, older cousin.'
Pope Francis blamed Global warming on 'human selfishness.'
One hundred volunteers in Bhutan set a new Guinness World Record when they planted 49,672 trees in one hour.
A ban on diesel cars was called for in France.
The Rosetta Philae became the first-ever probe to land on a moving comet.
A Spanish nurse became the first person to contract Ebola outside of West Africa.
Asteroid 2014 RC passed safely by Earth at a distance of 24,800 miles away.
Burger King agreed to buy out the donut chain Tim Hortons for $11 billion.
The World Health Organization announced the Ebola outbreak in West Africa.
US Secretary of State John Kerry spoke to college students in Jakarta, Indonesia, about the looming threat of Climate Change.
Kristofer Helgen announced the discovery of the olinguito, a mammal of the raccoon family Procyonidae.
The International Astronomical Union named Pluto's fourth and fifth moons Kerberos and Styx.
Two Earth-like planets in one solar system were discovered.
Europe's Planck spacecraft found evidence that our universe is 13.8 billion years old.
A Duke University neuroscientist connected two rat brains together over the internet.
A category 3 blizzard wreaked havoc in the US and Canada.
A study was published by the journal Nature saying that scientists had identified four distinct types of breast cancer.
SpaceX's Dragon became the first commercial spacecraft to dock at the International Space Station.
Wendy's became the world's second best-selling hamburger chain, overtaking Burger King.
