Explanation:

According to the India Meteorological Department (IMD)’s State of the Climate Report, the year 2020 was the eighth warmest since India started keeping records in 1901.

• Such temperature trends were reported despite the cooling effect of La Nina, a global weather pattern that prevailed in 2020 and is linked to substantially below normal temperatures in winter.
• El Nino and La Nina are the extreme phases of the El Niño and the Southern Oscillation (ENSO) cycle.
• El Niño has a warming influence on global temperatures, whilst La Nina has the opposite effect.
• La Nina typically has a cooling effect on global temperatures, but this is now offset by global warming due to greenhouse gas emissions. 
• As a result, La Nina years now are warmer than years with El Nino events of the past.
• ENSO is a periodic fluctuation in sea surface temperature and the air pressure of the overlying atmosphere across the equatorial Pacific Ocean. It has a major influence on weather and climate patterns such as heavy rains, floods and drought.

Hence only statement 1st is correct.