Another recurring point of criticism is the CO₂ footprint of tulips, particularly due to the heat required during forcing. While natural gas was mainly used in the past, growers are increasingly investing in sustainable energy sources, such as:
Not every grower can immediately switch completely to this, partly due to costs and grid capacity. Nevertheless, the total climate impact of tulips is relatively low. Tulips only need a few weeks of heat; most of the cultivation period the bulbs are stored cold. In addition, tulips are:
Life cycle analyses show that a locally grown tulip bouquet has an average CO₂ footprint of approximately 0.7 kg CO₂ equivalent, which is classified by Milieu Centraal as low compared to many other flowers and consumer products.