In medicine (gastroenterology), angiodysplasia is a small vascular malformation of the gut. It is a common cause of otherwise unexplained gastrointestinal bleeding and anemia. Lesions are often multiple, and frequently involve the cecum or ascending colon, although they can occur at other places.Treatment may be with colonoscopic interventions, angiography and embolization, medication, or occasionally surgery.igns and symptoms [edit]. Although some cases present with black, tarry stool (melena), the blood loss can be subtle, with the anemia symptoms predominating. Fecal occult blood testing is positive when bleeding is active.
Most climate scientists agree the main cause of the current global warming trend is human expansion of the greenhouse effect1 â warming that results when the atmosphere traps heat radiating from Earth toward space. Certain gases in the atmosphere block heat from escaping.
The carbon cycle is complex, but understanding how it works is important in order to understand why the climate is getting hotter. The Earth's atmosphere traps heat at the planet's surface. This is known as the greenhouse effect, a necessity for life on earth. However, when atmospheric concentrations of certain gases rise, they intensify the heat-trapping greenhouse effect. Carbon dioxide is a major greenhouse gas, and rising concentrations of CO2 are followed by rising heat levels.