Consider the following activities : 1. Spreading finely ground basalt rock on farmlands extensively 2. Increasing the alkalinity of oceans by adding lime 3. Capturing carbon dioxide released by various industries and pumping it into abandoned subterranean mines in the form of carbonated waters How many of the above activities are often considered and discussed for carbon capture and sequestration?
Explanation
All three activities mentioned are indeed methods often considered and discussed for carbon capture and sequestration.
* Spreading finely ground basalt rock on farmlands extensively is known as enhanced weathering. The basalt reacts with carbon dioxide in the atmosphere and forms stable carbonates, effectively storing the carbon dioxide and preventing it from contributing to global warming.
* Increasing the alkalinity of oceans by adding lime can help absorb more carbon dioxide from the atmosphere. The increased alkalinity enhances the ocean's capacity to act as a carbon sink.
* Capturing carbon dioxide released by various industries and pumping it into abandoned subterranean mines in the form of carbonated waters is a direct method of carbon capture and sequestration where carbon dioxide is captured at its source and then stored in a way that prevents it from being released into the atmosphere.