Proceedings of the National Academy of Sciences, Volume 122, Issue 44, November 2025. SignificanceCigarette butts are the most common form of litter in urban green spaces worldwide, yet their microbiological risks remain largely overlooked. In this nationwide study across Chinese cities, we show that cigarette butts harbor significantly …
Observations from the Little Bunker
Last updated: November 30, 2025 04:25 AM
Atmospheric CO₂
426.8 ppm
+18.1
ppm/year
Atmospheric CH₄
1927.61 ppb
+2.73
ppb/year
Global Temperature
+1.48 °C
Peak: +1.73°C
World Population
8.1 billion
+67
million/year