We increased CO2 concentration by about 200 parts-per-million (a factor of about 2x), and increased the average temperature by about 1-2°C. Rain patterns are slightly different. Ocean PH levels dropped by about 0.04 .
Sure, given how delicate the biosphere is, these small changes have a significant effect. However, if we look at Earth on the same scale as any other object in the solar system, the environment on Earth today is almost identical to the environment on Earth 1,000 years ago. The atmosphere is about 1023 millibars; 78% nitrogen, 21% oxygen, 1% argon, and 0.04% everything else. Liquid water covers most of the surface, with an active water cycle causing water rain to occur periodically over much of the planet.
The temperature change is so small, that we would not notice it if it were on any other planet in the solar system, and it is far below the noise floor of day-to-day variance