Leonardo DiCaprio's environmental fund donated $5 million in the battle against Amazon rainforest fires that were devastating the area.
A funeral was held in Iceland for the loss of the Okjökull glacier.
A rainfall survey named 'It is raining plastic' announced that tiny plastic particles were found in 90% of rain samples in Colorado, US.
World Resources Institute reported that a quarter of the world's population is running out of water.
The UK had its hottest day on record.
An asteroid, dubbed 'City Killer,' came closer to Earth than the moon and was almost undetected.
Due to climate change, a deadly heatwave landed in North-East America.
Transgender became no longer classified as a mental health illness by the World Health Organization.
The UN reported that one million plant and animal species were at risk of extinction.
Climate change activist Greta Thunberg gave a speech in London, leading to protests across the city for four days.
Using gene therapy, eight babies suffering from ''bubble boy disease" were cured in Memphis, Tennessee.
The first photo of a black hole that was taken in 2017 was announced to the public.
Dutch ecologists reported that wolves were living in the Netherlands again for the first time in 140 years.
Researchers discovered that as many as 600 million birds die in the US every year after flying into skyscrapers.
The European Union Parliament declared single-use plastics were to be banned by 2021.
The first kidney transplant between two persons with HIV occurred in Boston, Massachusetts, US.
Game of Thrones star Emilia Clarke shared her experience of fighting for her life after suffering two brain aneurysms during filming.
Researchers discovered molecules on people's skin that are early warning signs of Parkinson's disease, aided by a woman's nose.
1.4 million students across 125 nations participated in the School Strike for Climate.
Kangaroo fossil research showed that they may have learned to hop over 20 million years ago.
ScienceMag reported that honey bees are found to be able to use colors to help them carry out simple arithmetic.
The World Economic Forum announced that there will be more plastic than fish in our oceans by as early as 2050.
In the Global Carbon Project, it was reported that CO2 emissions reached an all-time high (up 2.7%) driven by coal use in China and the consumption of oil.
French couture house Chanel ended its use of fur and exotic skins, following suit of bans by other companies.
The discovery of an Earth-like planet 3.2 times bigger than our world was announced.
A tiger, who hunted and killed 13 people, was killed after a large-scale hunt in Central India.
Palau's archipelago became the first country in the world to ban the use of sunscreen containing harmful chemicals that destroy reefs.
The World Wildlife Fund blamed humanity's rapidly expanding consumerism for decreasing 60% of the world's wildlife between 1970 & 2014.
The EU declared that single-use plastics would be banned by 2021.
An intergovernmental panel on Climate Change reported that the planet will heat up by 2.7°F by 2040, which will wreak havoc on our world.
A Neptune-sized exomoon became the first one discovered outside the Solar System.
Science magazine announced that half the killer whale population would likely die due to human pollution.
A report published claimed that the fossils of Dickinsonia were the oldest animals to roam the planet.
A sea swimmer in his mid-twenties was bitten and killed by a shark near Newcomb Hollow Beach, Massachusetts, US.
The World Health Organization (WHO) announced that measles cases were at an all-time record high, with 41,000 in the first half of the year alone.
Monsanto became liable to pay out $289 million in damages to a groundsman who got terminal cancer from its 'Roundup' weed killer.
New South Wales, Australia, announced they were 100 percent in drought.
A deadly 106°F heatwave in Japan killed at least 65 people, and more than 22,000 were hospitalized.
Forest fires spread across large areas of Sweden.
Twelve new moons were discovered in Jupiter's orbit, bringing the planet's total number of moons to 79.
A newly discovered water beetle was named after Leonardo DiCaprio.
The last male northern white rhinoceros died.
Singer and actress Barbra Streisand announced she had her pet dog cloned twice.
It was announced that citrus fruit originated in the Himalayas millions of years ago.
Twelve camels found to have Botox in their lips were disqualified from a Camel Beauty Contest.
The Sahara desert was blanketed in snow.
A trial for Huntington's disease procured positive results.
Eight Donkeys were freed from jail after four days in Orai, Uttar Pradesh, India.
A baby girl named Vanellope Wilkins had her heart successfully put back inside her body.
Nineteen countries vowed to gradually phase out coal at the United Nations Summit in Bonn, Germany.
