Final answer:
The orbit of the earth drifting continents does not have a big impact on the climate.
Step-by-step explanation:
The earth system process that does not have a big impact on the climate is d. the orbit of the earth drifting continents. On a time scale of millions of years, the movement and location of continents is the biggest influence on Earth's climate system.
The position of continents affects ocean and atmospheric circulation, which are responsible for redistributing heat around the planet. However, the orbit of the Earth and the drifting continents do not have a significant impact on the climate on shorter timescales.