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Why the US rejoining the Paris climate accord matters at home and abroad — 5 scholars explain Christopher Furlong/Getty Images Morgan Bazilian, Colorado School of Mines; Deb Niemeier

The image of a female Asian elephant in a tea plantation on the fringes of Kaziranga National Park in India, bordering the Eastern Himalaya biodiversity hotspot, exemplifies potential impacts to endangered species conservation in cropland-impacted parks. The elephant in the image is mock charging at rescuers extracting her calf from a trench at the edge of the field.Image courtesy of Sashanka Barbaruah-Wildlife Trust of India

Across nearly all types of cancer, the number one cause of death is not the primary tumor itself, rather, it is the spread of cancer to other parts of the body. This spread, known as metastasis, occurs when cancer cells break away from a primary tumor site and travel via the bloodstream or the lymphatic system to form new tumors in other parts of the body.