Option 1: 2019 -> This predates the actual launch of the Climate Change Knowledge Portal by India's Ministry of Environment, Forest and Climate Change.
Option 2: 2020 -> The Climate Change Knowledge Portal (CCKP) was officially launched by India in this year to provide comprehensive climate data and information.
Option 3: 2021 -> This is after the portal's actual launch year, though the platform continued to be updated and expanded during this period.
Option 4: 2022 -> This is two years after the portal was established, well beyond its initial launch date.
Hence, Option 2: 2020 -> India's Climate Change Knowledge Portal was launched in 2020 by the Ministry of Environment, Forest and Climate Change to serve as a centralized platform providing climate change-related data, vulnerability assessments, and adaptation information for various stakeholders -> correct