Team Trees has also received substantial criticism from some, primarily regarding its effectiveness and whether or not the science behind the recapture of atmospheric carbon with trees is adequate. Chemist and YouTube personality Phil Mason put the effect of planting 20 million trees into perspective, by showing that 40 million trees needed to be planted per day just to offset the carbon footprint of the United States, requiring close to 15 billion trees per year for the United States alone. In his video, Mason also addressed global warming and climate change denial.[37]