D. All of the above are true.
Local environmental changes can have global effects in a variety of ways. Organisms can move from one environment to another, which can impact ecosystems and food webs on a larger scale. For example, the introduction of non-native species into a new environment can disrupt the balance of that ecosystem and impact other ecosystems that are connected to it.
Air and water move from region to region through atmospheric and oceanic circulation patterns, which can transport pollutants, nutrients, and other substances across long distances. For example, increased carbon dioxide emissions in one location can contribute to global climate change, which can affect temperatures and weather patterns around the world.
Therefore, local environmental changes can have far-reaching impacts on global systems and processes, highlighting the importance of considering the interconnectedness of the natural world and the potential consequences of human activities on a global scale.