Quiz on World Environment Day: Prove You Know the Planet

The Great Barrier Reef stretches over 2,300 kilometers along the northeastern coast of Queensland, Australia, and is the world's largest coral reef system. It was listed as a UNESCO World Heritage Site in 1981 and supports extraordinary marine biodiversity including over 1,500 species of fish and 4,000 species of mollusk. The reef has experienced multiple mass bleaching events in recent decades driven by rising ocean temperatures caused by climate change, with scientists warning that sustained warming threatens its long-term survival.

The answer is True. The Dodo was a flightless bird endemic to the island of Mauritius in the Indian Ocean and became extinct around 1681 following the arrival of humans and the animals they brought with them, including rats, pigs, and dogs, which preyed on Dodo eggs and young. The Dodo's extinction is one of the most cited examples of human-caused species loss and has made the bird an enduring symbol of the consequences of habitat destruction and the introduction of invasive species to isolated ecosystems.

Tanzania is home to the Serengeti National Park, one of the most celebrated wildlife ecosystems on the planet and a UNESCO World Heritage Site. The Serengeti hosts the Great Migration, in which approximately 1.5 million wildebeest, along with zebras and gazelles, travel in a circular annual route across the Serengeti and into Kenya's Maasai Mara in search of fresh grazing. The migration is widely considered the largest overland animal movement on Earth and is a defining symbol of African wildlife.

Biodiversity loss refers to the ongoing decline in the variety of life on Earth at the ecosystem, species, and genetic levels. The United Nations has identified biodiversity loss as one of three interconnected planetary crises alongside climate change and pollution. Current rates of species extinction are estimated to be 100 to 1,000 times higher than the natural background rate, prompting scientists to describe the current period as the sixth mass extinction event in the history of life on Earth.

The answer is True. The Congo Basin rainforest is the second largest tropical rainforest on Earth, covering approximately 3.3 million square kilometers across six Central African countries including the Democratic Republic of Congo, Republic of Congo, Cameroon, Central African Republic, Equatorial Guinea, and Gabon. It is home to extraordinary biodiversity including forest elephants, gorillas, chimpanzees, okapis, and thousands of plant species. The Congo Basin is also a critical global carbon sink and plays a vital role in regulating the regional and global climate.

The Pacific Ocean is the largest and deepest ocean on Earth, covering approximately 165 million square kilometers and accounting for nearly half of the world's total ocean area. It is bordered by Asia and Australia to the west and the Americas to the east. The Mariana Trench, located in the western Pacific, contains the Challenger Deep, the deepest known point on the planet at approximately 11,034 meters below sea level. The Pacific Ocean plays a critical role in regulating global climate and weather patterns.

Dead zones, also known as hypoxic zones, are areas of coastal ocean where dissolved oxygen levels drop so low that most marine life cannot survive. They are primarily caused by agricultural runoff containing nitrogen and phosphorus fertilizers that trigger massive algae blooms. When the algae die and decompose, bacteria consume the available oxygen in the process, creating the hypoxic conditions. The Gulf of Mexico contains one of the largest dead zones in the world, driven by nutrient runoff from the Mississippi River basin.

The answer is True. Antarctica is technically the largest desert on Earth by area, covering approximately 14.2 million square kilometers, because a desert is defined as an area that receives very little precipitation, typically less than 250 millimeters per year, rather than by temperature or the presence of sand. The interior of Antarctica receives very little snowfall annually, qualifying it as a cold desert. The Sahara, at approximately 9 million square kilometers, is the world's largest hot desert and the third largest desert overall.

The Kunming-Montreal Global Biodiversity Framework was adopted at the COP15 biodiversity summit in Montreal in December 2022 and established a landmark global target to protect at least 30 percent of the world's land and ocean areas by 2030, known as the 30x30 goal. The framework also set targets to restore 30 percent of degraded ecosystems and reduce the risk from pesticides. It was agreed by 196 countries and is considered the most significant global biodiversity agreement since the Convention on Biological Diversity was opened for signature in 1992.

Ocean warming causing bleaching, ocean acidification from CO2 absorption, and overfishing are all well-documented threats to coral reefs globally. However, coral reefs do not cause ocean acidification by releasing carbon dioxide. In fact, the reverse is true: increased CO2 in the atmosphere is absorbed by the ocean, lowering the pH and making the water more acidic, which dissolves the calcium carbonate structures that corals build. Option D reverses the cause and effect and is scientifically incorrect.

The Galapagos Islands are an archipelago belonging to Ecuador, located approximately 900 kilometers off the coast of South America in the Pacific Ocean. The islands are one of the most scientifically significant ecosystems on Earth and were a UNESCO World Heritage Site in 1978. Charles Darwin visited the Galapagos in 1835 during his voyage on HMS Beagle and made observations about the unique species on each island, including finches adapted to different food sources, that contributed directly to his development of the theory of evolution by natural selection.

The answer is True. The ecological footprint is a measure of the biologically productive land and water area required to produce the resources that a population consumes and to absorb the waste it generates, including carbon emissions. It is expressed in global hectares and is compared against the available biocapacity of the Earth. When the combined ecological footprint of humanity exceeds the Earth's total biocapacity, it results in ecological overshoot, a situation that has persisted every year since the early 1970s and grows larger each decade.

Desertification is the process by which fertile land becomes increasingly arid, degraded, and unproductive, often resulting in the expansion of desert-like conditions in non-desert areas. It is driven by a combination of climate factors such as drought and human activities including deforestation, overgrazing, and unsustainable agriculture. The United Nations Convention to Combat Desertification estimates that approximately 3.2 billion people are affected by land degradation globally, with dryland regions in Africa, Asia, and South America being particularly vulnerable.

Sagarmatha National Park in Nepal encompasses Mount Everest, known as Sagarmatha in Nepali, and the surrounding Himalayan peaks. It was designated a UNESCO World Heritage Site in 1979 and is a critical habitat for endangered and rare species including snow leopards and red pandas. The park presents significant conservation challenges due to the combination of glacial retreat driven by climate change and increased pressure from mountaineering tourism. Sagarmatha is one of the world's most recognizable protected areas due to its association with the highest mountain on Earth.

Oceans do cover approximately 71 percent of Earth's surface, the ocean absorbs roughly 30 percent of human CO2 emissions helping to slow climate change, and marine protected areas covered approximately 8 percent of the world's oceans as of recent estimates, falling short of international conservation targets. However, the world's oceans are not cooling. They are measurably warming as a result of absorbing excess heat from the atmosphere caused by increased greenhouse gas concentrations. Ocean warming is one of the most clearly documented consequences of climate change, making option D incorrect.