You should take a year of calculus and then calculus-based physics before you apply. Taking calculus this summer and then physics next year would probably be the best strategy. I strongly recommend taking an intro geology course as well if you haven’t yet.
Geology programs realize that many students come to geology late in their college careers (one PhD student at my university was a music major!) and are therefore flexible about a background in the earth sciences. It’s not unusual for MS students to catch up on some of the basics (mineralogy and petrology, historical geology, stratigraphy, structural geology, geomorphology) in their first year. You won’t have time to take calc or physics, though, and those are pretty standard requirements for admission.
Law school is a very expensive enterprise, the job market is tight, and environmental law doesn’t pay terribly well. Ponder your options carefully before switching tracks.
You may want to consider environmental policy or environmental management (MPP/MEM) programs instead, which sometimes offer TAships that help allay the cost of tuition. Your science background would be strong enough, but you’d need to take statistics and microeconomics.
Yes, atmospheric science and physical oceanography programs are very math-heavy. All require at least calculus, and you should really take differential equations as well.