G20: Key global leaders meet annually on critical issues.
India's 2023 presidency expanded G20 to G21 with African Union.
Critics see G20 as symbolic, lacking concrete results.
G20 originated from the G7 to address economic challenges.
Formed in 1999, G20 tackles global economic issues.
Achieved agreements, like the Paris Accord, but faces challenges.
G20 coordinates on global matters, effectiveness varies.