Red Leaf Crossword

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Across
  1. 2. Tennessee's national park is the most visited in the US, but suffers from acid fog, invasive wild hogs, and air pollution blown from midwestern coal plants that damages its famous blue haze.
  2. 8. US average temperature up 1.8°F since 1900; causing longer wildfire seasons, stronger hurricanes, and shifting plant hardiness zones northward.
  3. 10. Thought extinct since 1944, this large woodpecker was reportedly rediscovered in Arkansas in 2004 and again in Louisiana and Florida thereafter; its decline was caused by logging of southern bottomland forests and ruthless collecting, and its fate remains hotly debated among ornithologists.
  4. 13. Lake Erie's August bloom covers 700 square miles; fed by Ohio farm runoff, it makes Toledo's tap water undrinkable and kills dogs within hours.
  5. 15. PCBs from old electrical equipment build up in Great Lakes trout and eagles; a single ounce of PCB concentrate can contaminate all fish in Lake Superior.
  6. 19. US lost 40,000 square miles of forest since 2000 — area larger than Indiana — mainly from suburban sprawl, logging, and road building.
  7. 21. Open‑pollinated seed variety passed down 50+ years; unlike hybrids, saved seeds grow identical to the parent plant, preserving genetic diversity.
  8. 23. Birds, bats, bees, beetles, butterflies, and moths: without this animal group, one out of every three bites of US food (apples, almonds, squash) would vanish.
  9. 26. A 200‑square‑foot yard feature can absorb 4,000 gallons of stormwater yearly — water that otherwise washes car oil, pet waste, and road salt into local creeks.
  10. 27. Wind and solar provided 14% of US electricity in 2022, up from 2% in 2005 — still far below coal and natural gas.
  11. 28. Type of plant society found in all 50 states; members work to replace invasives like kudzu and certify yards that support local caterpillars birds need to feed chicks.
  12. 29. Mature US forests store over 100 metric tons of carbon per acre; clearing it releases that within decades, but regrowth takes a century.
  13. 34. An ancient logjam on Louisiana and Arkansas's Red River stretched over 100 miles, created lakes like Caddo Lake, and protected the Caddo tribe from European invasion for 150 years; the US Army Corps destroyed it permanently in 1873 using nitroglycerin, and the river has never been the same.
  14. 35. Michigan's Upper Peninsula national lakeshore features 15 miles of colorful sandstone cliffs; threatened by shoreline erosion from climate‑driven high water levels and invasive mussels that disrupt Lake Superior's food web.
  15. 37. US loses 2 million acres of farmland and open space per year — the equivalent of Delaware every 18 months — fragmenting wildlife habitat and doubling car trips.
  16. 39. This pollutant caused acid rain that killed forests in the Adirondacks and Smokies; US emissions dropped 90% since 1990, but some coal plants still exceed legal limits.
  17. 40. Monarch butterflies dropped 80% in 20 years because Midwest lost 90% of this plant to corn and soybean fields and roadside mowing.
  18. 41. Nitrogen oxides from US cars and power plants react with ammonia from farms to create fine soot (PM2.5), which kills roughly 100,000 Americans prematurely each year.
  19. 44. Virginia's Shenandoah National Park lost over 50% of this cold‑water fish in 70% of its streams between 1996 and 2022; rising stream temperatures from climate change are the primary threat, though recovery in some acid‑sensitive streams suggests Clean Air Act improvements are helping.
  20. 46. New Jersey's million‑acre forested region atop a vast underground aquifer; fire‑adapted ecosystem with rare pygmy pitch pines, threatened by suburban development and off‑road vehicles.
  21. 49. The Bluegrass State is home to Hazel Dell Meadow, a Highland Rim Wet Barren — a globally rare grassland‑wetland hybrid. Fewer than 2 acres remain there, and only a handful exist worldwide.
  22. 50. Japanese vine introduced in 1876 that now covers 200,000+ southern US acres, growing a foot per day and smothering trees and power lines.
  23. 51. US coasts saw 6–9 inches since 1960; Miami, Norfolk, and New Orleans now have routine sunny‑day flooding from high tides alone.
  24. 52. 19th‑century commercial slaughter of wild game for urban markets; unlike subsistence hunting for food, this practice wiped out passenger pigeons (billions to zero), nearly exterminated bison, and drove snowy egrets to near‑extinction for their plumes.
  25. 53. This gas traps 80x more heat than CO2 over 20 years; US landfills and livestock operations leak it constantly, often invisibly.
Down
  1. 1. North Carolina's unique wetland type, found mainly on the coastal plain; acidic, shrub‑dominated, and home to carnivorous plants like Venus flytrap.
  2. 3. US Endangered Species Act saved 99% of listed species (bald eagle, gray wolf); yet Congress has underfunded it by 50% annually, leaving 300+ species waiting decades for protection.
  3. 4. Louisiana has lost over 2,000 square miles of coastal wetlands since 1930 — an area the size of Delaware — due to levee construction, oil canals, saltwater intrusion, and logging; disappearing at a football field every hour.
  4. 5. Fragments smaller than a sesame seed found in 94% of US tap water samples and in human placentas; shed from synthetic clothes, tires, and cosmetic scrubs.
  5. 6. US West Coast oyster hatcheries nearly collapsed in 2007 because CO2 makes seawater corrosive to young shells and coral.
  6. 7. Missouri and Arkansas stream system with crystal‑clear water and ancient fish species; threatened by poultry farm runoff, lead mining contamination, and failing septic tanks.
  7. 9. Lower 48 states lost 53% of original 117 million acres — mostly drained for farming; each remaining acre filters 100,000 gallons of water daily.
  8. 11. Nocturnal mammal that saves US farmers over $3 billion yearly in pest control; threatened by white‑nose syndrome, wind turbine collisions, habitat loss from deforestation, and pesticide poisoning.
  9. 12. Strips of native grass between farms and streams can cut nitrogen runoff by 90%; only 4% of US corn and soy acres use them, despite free USDA funding.
  10. 14. 11,000+ US species; most are nocturnal pollinators for night‑blooming flowers, yet killed by bug zappers that don't affect mosquitoes and by outdoor lighting.
  11. 16. This common lawn practice, especially weekly, produces 11 times more air pollution per hour than a new car, and lawns themselves are monocultures that provide no food or habitat for wildlife, require massive water and fertilizer inputs, and increase stormwater runoff carrying pollutants into local waterways.
  12. 17. The practice of harvesting wild edible plants, mushrooms, and nuts; over‑harvesting of ramps and ginseng has devastated eastern US forests, while sustainable foraging can reconnect people to local ecosystems.
  13. 18. Mulefoot hog and San Clemente goat have US populations under 500; factory farming replaced thousands of local breeds with just three commercial ones.
  14. 20. Prized spring mushroom that fruits after forest fires; in the US, it's nearly impossible to farm commercially, so overzealous foragers have damaged fragile soils and depleted wild populations in some western states.
  15. 22. Within Kentucky's Daniel Boone National Forest, this 38,000‑acre district approved a 2022 logging project removing 10,000 truckloads of timber, fragmenting habitat for endangered bats and migratory songbirds.
  16. 24. Iowa lost 99.9% of its original tallgrass prairie; its deep roots (15 feet down) stored more carbon per acre than a forest, but plowing released it into the air.
  17. 25. Atrazine, the second most used US herbicide, turns male frogs hermaphroditic at 1 part per billion; found in Midwest tap water after spring rains.
  18. 30. Critically endangered canine once declared extinct in the wild; fewer than 25 remain in eastern North Carolina due to gunshot deaths, vehicle collisions, and hybridization with coyotes.
  19. 31. US lost over 500,000 of these operations since 1980 — about 15 per day — squeezed by corporate consolidation, rising debt, and climate extremes; surviving farms grow older with no successor.
  20. 32. Fungi that break dead wood into soil; US old‑growth forests depend on underground mycelial networks to share water and nutrients between different tree species.
  21. 33. Wetland plant with edible tubers once a Native American staple; lost from 70% of its former US range due to agricultural drainage and development.
  22. 36. A facility that stores dormant seeds at subzero temperatures to preserve genetic diversity; the world's largest is in Norway, but the US has critical ones for heirloom vegetables and native prairie plants threatened with extinction.
  23. 38. US landfills emit 18% of human‑related methane; composting food scraps could cut that in half while replacing synthetic fertilizers made from natural gas.
  24. 42. Beetle that flashes to find mates; numbers crashing due to light pollution disrupting signals, lawn pesticides killing larvae in soil, and loss of damp meadows.
  25. 43. Coal mining practice that blasts 500+ feet off Appalachian peaks, burying headwater streams; nearby communities face toxic dust, contaminated wells, and spikes in cancer and birth defects.
  26. 45. Fungal disease that killed 4 billion American chestnut trees in the early 1900s, removing a keystone species that fed wildlife and provided rot‑resistant lumber.
  27. 47. 1990 US law that phased out leaded gas, cut acid rain, and reduced air toxics; prevented over 200,000 US deaths by 2020, though ozone pollution still kills 30,000 yearly.
  28. 48. Fuzzy native pollinator with some US species down 96% since 1990; threatened by a fungus spread from commercial greenhouses and by neonicotinoid pesticides.