Final answer:
Logging is a key impact humans have on rainforests, but not on the tundra. It leads to deforestation, which causes habitat loss, greenhouse gas emissions, and soil erosion, issues particularly prevalent in the Amazon rainforest.
Step-by-step explanation:
One way humans have impacted the rainforests but not the tundra is logging. This process involves cutting down trees for lumber and clearing land for agriculture, which is a significant issue in the Amazon rainforest. In the context of the tundra, activities such as oil drilling, mining, and overgrazing could also have an impact, but logging is particularly detrimental to rainforests due to the loss of trees leading to habitat destruction, increased greenhouse gases, and soil erosion. Cattle ranching in the Amazon Basin has led to deforestation, driven by the demand for beef and land for agricultural expansion, exacerbating these environmental issues.
In the Amazon Basin, the rapid increase of cattle numbers and industrial soy farming have greatly contributed to rainforest depletion. Timber extraction, although variable, causes significant ecological changes and loss of biodiversity in these forests, which is not applicable to the tundra ecosystem.