The main cause of rising sea levels is the melting of the ice sheets in Greenland and Antarctica. NASA found that the rise in sea level over the last 30 years (1993-2023) was around 10cm.

Source:

NASA's Goddard Space Flight Center; Bamber, J. L., Oppenheimer, M., Kopp, R. E., Aspinall, W. P., & Cooke, R. M. (2019). Ice sheet contributions to future sea-level rise from structured expert judgement. Proceedings of the National Academy of Sciences, 116(23), 11195- 11200. available online