Nisreen Elsaim is an environmental and climate activist and has been involved in activism since 2012. She has a Bachelor's degree in physics and master’s degree in renewable energy from the University of Khartoum, Sudan. 

Nisreen is the general coordinator for Youth and Environment - Sudan (YES) platform to give all environment working youth the networking they need.

She is also the Chair of Sudan Youth Organization on Climate Change (SYOCC), which is a youth-led organisation.

As part of many regional and international platforms Nisreen has led and mentored large number of young people with in YOUNGO, PACJA, Abu Dhabi youth Voices and others.

Nisreen is also a junior negotiator with the African Group of Negotiators in technology transfer focusing on the policies of countries regarding climate change and renewable energies. She has written several policy papers on climate change, renewable energy, gender and youth empowerment. 

In 2020 Nisreen was chosen to chair the UN Secretary General Youth Advisory Group on Climate Change along with 6 other young climate activists. 

In 2022 she was one of the first Cohort of Marianne Initiative for human rights defenders, which an initiative by the French president. 

Currently, Nisreen is a fellow with Robert Bosch Academy.