This splinter meeting is the first working group meeting of the newly founded IAG Joint Working Group (IAG JWG) in January 2024 under the umbrella of the Inter-Commission Committee on Geodesy for Climate Research (ICCC). Our mission is aimed at researchers interested in using Global Navigation Satellite System (GNSS) sensors for mass-market (or low-cost) climate and environmental monitoring to redefine methods to enable reliable measurements. In addition to precise positioning, we are researching the determination of important variables such as the water equivalent of snow and the water vapour content of the atmosphere. Being a global initiative, our aim is to overcome technological boundaries and promote international co-operation to tackle the challenges of climate change. All researchers interested in the use of small-scale GNSS sensors for climate monitoring and research are cordially invited to join.