Answer : 1. "किसी को पीछे न छोड़ना, सभी को गिनना"
Explanation :

World Population Day is observed annually on July 11 since 1990, focusing on population growth, environmental impact, and development issues. Established by the UNDP in 1989, the date marks the global population surpassing five billion on July 11, 1987. The 2024 theme, “To Leave No One Behind, Count Everyone,” emphasizes the importance of population data for healthcare and rights, addressing the needs of marginalized communities.