August 2021. Over the past five years, the supply of carbon credits grew 230 percent, driven by nature-based carbon credits. However, demand continues to lag supply—for example, in 2021, suppliers issued nearly 300 million tons (Mt) of carbon offsets, but companies only purchased 161 Mt—contributing to low carbon credit prices. These numbers compare with total global greenhouse gas emissions of roughly 50 billion tons (Gt) of CO2 equivalent per year. SSA’s credit issuance in international voluntary markets is steadily growing ( Figure 8 ). SSA-issued credits in