Here's a few more things that puts CO2 into the air:

1. Volcanic eruptions
2. Wildfires
3. Decomposition of organic matter (e.g., dead plants and animals)
4. Soil respiration
5. Methane emissions from wetlands
6. Oceanic CO2 release due to temperature changes
7. Terrestrial CO2 release due to temperature changes
8. Forest fires
9. Geothermal activity
10. CO2 released from oceans due to upwelling
11. Decay of submerged aquatic vegetation
12. Termites and other insects producing methane
13. Emission from plant respiration
14. CO2 from algae blooms
15. Methane emissions from ruminant animals (e.g., cows)
16. Carbon release from permafrost thaw
17. Emissions from peatlands
18. Rotting of fallen leaves
19. Decomposition of wood
20. Natural weathering of rocks
21. CO2 release during volcanic degassing
22. CO2 from natural water bodies (e.g., lakes)
23. Decomposition of corals
24. CO2 emissions from natural geysers
25. CO2 release from carbonate minerals in soils
26. CO2 emissions from termite mounds
27. Decomposition of kelp and seaweed
28. CO2 release from limestone dissolution
29. Emissions from hydrothermal vents
30. CO2 release from carbonate reefs
31. Gas exchange between oceans and the atmosphere
32. CO2 release from hot springs
33. Methane release from mud volcanoes
34. CO2 emissions from salt pans
35. Decay of submerged aquatic vegetation
36. CO2 from volcanic lakes
37. Methane emissions from swamps
38. Methane emissions from rice paddies
39. Methane emissions from natural seeps
40. CO2 from decaying phytoplankton
41. Emissions from subglacial volcanoes
42. CO2 release from soil erosion
43. CO2 from deep-sea hydrothermal systems
44. CO2 from thermal springs
45. Emissions from evaporating saline lakes
46. Emissions from desert sand dunes
47. CO2 from erosion of carbonate rocks
48. CO2 from hot deserts
49. Emissions from ocean upwelling zones
50. Emissions from karst landscapes
51. CO2 release from wildfires in grasslands
52. CO2 from natural oil seeps
53. Emissions from thawing ice sheets
54. CO2 release from lava flows
55. CO2 emissions from coastal erosion
56. Methane release from ocean sediments
57. Emissions from geologic faults
58. CO2 from salt marshes
59. Emissions from percolating groundwater
60. CO2 release from forest soils
61. Emissions from landslides
62. Methane release from submarine landslides
63. CO2 from volcanic soil degassing
64. CO2 emissions from decaying roots
65. Methane release from hydrothermal systems
66. CO2 from sinking plant material in water bodies
67. Emissions from subaerial volcanic eruptions
68. CO2 from the erosion of carbonate beaches
69. Methane emissions from fumaroles
70. CO2 release from natural coal fires