Quiz for World Environment Day: How Green Is Your Knowledge?

World Environment Day is observed annually on June 5 and is the largest international day dedicated to the environment, organized by the United Nations Environment Programme. The day was established by the United Nations General Assembly in 1972, coinciding with the opening of the Stockholm Conference on the Human Environment, and has been led by UNEP since 1973. Over 150 countries participate each year, making it one of the most widely observed environmental awareness days on the global calendar.

The answer is True. World Environment Day 2025 was held on June 5, 2025, with the theme Beat Plastic Pollution under the slogan Shared Challenge, Collective Action. The Republic of Korea served as the host country for the second time, having previously hosted in 1997 under the theme For Life on Earth. Global celebrations were organized at and around the Jeju International Convention Center on Jeju Island, mobilizing communities worldwide to refuse, reduce, reuse, and recycle plastics.

The Paris Agreement was adopted at the COP21 climate conference in Paris in December 2015 and entered into force in November 2016. It brought together nearly 200 countries in a landmark commitment to limit global average temperature rise to well below 2 degrees Celsius above pre-industrial levels, with efforts to limit warming to 1.5 degrees Celsius. Each country submitted nationally determined contributions outlining their plans to reduce emissions. The Paris Agreement represented a significant shift from previous climate frameworks by including both developed and developing nations.

Carbon dioxide is the most significant human-produced greenhouse gas driving climate change due to the sheer volume released through fossil fuel combustion, deforestation, and industrial processes. While methane and nitrous oxide are more potent greenhouse gases per molecule, carbon dioxide is far more abundant and has a very long atmospheric lifespan of hundreds to thousands of years. Global CO2 concentrations have risen from approximately 280 parts per million before the Industrial Revolution to over 420 parts per million as of recent measurements.

The answer is False. While the Amazon rainforest does produce vast amounts of oxygen through photosynthesis, mature forests also release an approximately equal amount of carbon dioxide through respiration and decomposition, meaning the net oxygen production of a healthy mature forest is roughly zero. A 2021 study found that due to deforestation and degradation, parts of the Amazon are now releasing more carbon dioxide than they absorb, shifting some regions from a carbon sink to a carbon source. The lungs of the Earth description is poetic but scientifically oversimplified.

The Montreal Protocol on Substances that Deplete the Ozone Layer was signed in 1987 and is widely regarded as the most successful international environmental treaty in history. By phasing out chlorofluorocarbons, hydrochlorofluorocarbons, and other ozone-depleting chemicals, the protocol allowed the ozone layer to begin recovering. Scientific assessments have since shown measurable healing of the ozone hole above Antarctica. The Montreal Protocol is considered a model for international environmental cooperation and proof that collective action can reverse human-caused environmental damage.

Brazil contains the largest portion of the Amazon River basin and the Amazon rainforest, the most biodiverse tropical ecosystem on the planet. The Amazon covers approximately 5.5 million square kilometers, with around 60 percent located within Brazilian territory. It is estimated to contain approximately 10 percent of all species on Earth across its trees, plants, insects, mammals, birds, and aquatic life. Deforestation in the Brazilian Amazon has been a major focus of international conservation efforts for decades.

The answer is True. World Environment Day was established by the United Nations General Assembly in 1972, coinciding with the opening of the Stockholm Conference on the Human Environment, which was the first major global summit specifically focused on international environmental issues. The conference produced the Declaration of the Human Environment and led directly to the creation of the United Nations Environment Programme. The first official World Environment Day was celebrated on June 5, 1974, with the theme Only One Earth.

A biodiversity hotspot is a geographic region with exceptionally high concentrations of endemic species, meaning species found nowhere else on Earth, that has also lost a significant portion of its original habitat. Conservation International defines a hotspot as an area that contains at least 1,500 species of vascular plants as endemics and has lost at least 70 percent of its primary vegetation. There are 36 recognized biodiversity hotspots worldwide, collectively covering just over 2 percent of the Earth's surface but containing more than half of all plant species and nearly half of all vertebrate species as endemics.

Rising temperatures, more frequent extreme weather events, and melting ice contributing to sea level rise are all consequences of climate change supported by overwhelming scientific consensus. However, human carbon dioxide emissions are not expected to peak and reverse naturally by 2030 without deliberate policy intervention. Scientific projections consistently show that without significant changes to energy systems, land use, and industry, global emissions will continue rising well beyond 2030, making option D incorrect and contrary to established climate science.

The International Union for Conservation of Nature, known as the IUCN, was founded in 1948 and is headquartered in Gland, Switzerland. It is the world's largest conservation network and maintains the IUCN Red List of Threatened Species, which is the most comprehensive global database for assessing the extinction risk of animals, plants, and fungi. The Red List uses categories including Least Concern, Vulnerable, Endangered, and Critically Endangered to classify species based on population trends, geographic range, and habitat status.

The answer is True. Scientific research has confirmed that plastic pollution has reached every ocean on the planet, including the deepest trenches of the deep sea. Microplastics, which are fragments smaller than 5 millimeters, have been detected in human blood in multiple studies and have also been found in human lung tissue and in the placentas of unborn children. The global production of plastic exceeds 400 million tonnes per year, and only a small fraction is effectively recycled, with the remainder entering landfills, incinerators, or the natural environment.

A circular economy is an economic model designed to eliminate waste and keep resources in continuous use for as long as possible. Instead of the traditional linear model of taking raw materials, making a product, and then discarding it, the circular economy designs products for longevity, reuse, repair, and recycling so that materials cycle back into the production system rather than becoming waste. The concept is central to addressing plastic pollution, climate change, and biodiversity loss simultaneously and is a key framework promoted by the United Nations Environment Programme.

Yellowstone National Park was established by the US Congress and signed into law by President Ulysses S. Grant on March 1, 1872, making it widely recognized as the world's first national park. The park sits primarily in the northwestern corner of Wyoming, with smaller portions extending into Montana and Idaho. Yellowstone is known for its extraordinary geothermal features including geysers, hot springs, and fumaroles, as well as its diverse wildlife including bison, wolves, bears, and elk. It became the model for national parks established around the world in subsequent decades.

World Environment Day is held on June 5 each year, the 2025 host was South Korea, and the day was established following the 1972 Stockholm Conference. However, Earth Day and World Environment Day are not held on the same date. Earth Day is celebrated on April 22 each year, while World Environment Day is on June 5. The two environmental observances exist independently and focus on different aspects of environmental awareness and action, making option D incorrect.