2002day.year

The "55 parties" clause of the Kyoto Protocol is reached after its ratification by Iceland.

After Iceland's ratification, the Kyoto Protocol reaches its required threshold of 55 parties, triggering its entry into force.
The Kyoto Protocol, adopted in 1997, set binding greenhouse gas emission targets for industrialized nations. Under its rules, the treaty required ratification by at least 55 parties accounting for 55% of developed-country emissions. On May 23, 2002, Iceland’s ratification fulfilled both thresholds, activating the protocol. This event marked a major step in international efforts to combat climate change. The Protocol officially came into force on February 16, 2005, after further ratifications. Iceland’s participation highlighted the role small nations can play in global environmental agreements.
2002 Kyoto Protocol Iceland
2006day.year

Alaskan stratovolcano Mount Cleveland erupts.

Mount Cleveland, an active stratovolcano in the Aleutian Islands, erupts with explosive blasts and ash clouds.
On May 23, 2006, Mount Cleveland, part of the Aleutian volcanic arc, erupted explosively. Pilots reported dense ash plumes reaching tens of thousands of feet, prompting aviation warnings across the North Pacific. The eruption produced lava flows and incandescent tephra cascading down the volcano's flanks. Although its remote location prevented direct human impact, the event highlighted the dangers posed to trans-Pacific flights and the dynamic nature of the Earth's crust. Scientists monitored seismic activity closely, studying ash samples to better understand volcanic processes in the Aleutians.
2006 stratovolcano Mount Cleveland
2015day.year

At least 30 people are killed as a result of floods and tornadoes in Texas, Oklahoma, and northern Mexico.

Deadly floods and tornadoes in Texas, Oklahoma, and northern Mexico kill at least 30 people and devastate communities.
Starting May 23, 2015, extreme weather unleashed powerful tornadoes and flash floods across parts of Texas, Oklahoma, and northern Mexico. Torrential rains caused rivers to swell, inundating homes, roads, and farmland, while twisters carved destructive paths through small towns. Rescue crews scrambled to evacuate stranded residents and recover those trapped in vehicles or buildings. At least 30 fatalities were reported, and hundreds suffered injuries or displacement. The severe storms highlighted the region's vulnerability to sudden weather shifts and prompted discussions on improving emergency preparedness and infrastructure resilience.
2015 floods and tornadoes