European Commission on the Environment
The main role of the European Commission's Environment Directorate-General (DG) is to initiate and define new environmental legislation and to ensure that agreed measures are put into practice in the EU Member States.
Intergovernmental Panel on Climate Change
"The Intergovernmental Panel on Climate Change (IPCC) is the United Nations body for assessing the science related to climate change."
See their reports, including their Synthesis Report.
The IEA is an autonomous organization which works to ensure reliable, affordable and clean energy for its 28 member countries and beyond. Today, the IEA’s four main areas of focus are: Energy security; Economic development; Environmental awareness; Engagement worldwide.
You can search by topics and countries.
They also have data and statistics and reports, including reports by country.
You may find these recent reports helpful:
UNEP's mission is to provide leadership and encourage partnership in caring for the environment by inspiring, informing, and enabling nations and peoples to improve their quality of life without compromising that of future generations.
See their publications and data, including the Annual Report.
UN Environment Management Group
"The United Nations (UN) Environment Management Group (EMG) is a system-wide coordination body on environment and human settlements."
See the EMG Strategic Narrative 2023 - 2030 and other publications.