Final answer:
Volcanic emissions can cause short-term climate changes, but their long-term effects are generally negligible.
Step-by-step explanation:
Volcanic emissions can have both short-term and long-term effects on the environment and climate. During a volcanic eruption, gases and solids are released into the atmosphere, including carbon dioxide, sulfur dioxide, and ash. These emissions can cause short-term climate changes, such as haze-effect cooling that lowers global temperatures for one or more years. However, the long-term effects of volcanic emissions are generally negligible, as these emissions remain in the atmosphere for a much shorter time than greenhouse gases.