The EIA energy profile for Nevada:

https://www.eia.gov/electricity/state/nevada/

provides basic statistics. Current electricity consumption is 36 million megawatt hours (MMWh) per year. Assuming a 15% growth of population by 2030 electricity consumption will grow to 41.4 MMWh. Currently about 10% of electricity is solar and 10% geothermal, a total of 7.2 MMWh. By 2030 half the electricity or 20.7 MMWH must be renewable. Subtract the existing 7.2 MMWh and we are left with 13.5 MMWh of new solar that must be added. According to the EIA 758 pounds of CO2 are emitted for each MWh. Assuming this figure approximately applies to fossil fuel use reduced as solar is added, the annual saving in CO2 will be 758 lbs times 13.5 milliion MWh. The annual saving will be 758*13,500,000/2204 or 4.6 million metric tons of CO2 per year.

The emissions by year and country to 2014 are available from CDIAC here:

https://cdiac.ess-dive.lbl.gov/trends/emis/tre_coun.html

Data for 2015-2017 can be found here:

https://edgar.jrc.ec.europa.eu/overview.php?v=CO2andGHG1970-2016&sort=des8

The increase per year for USA and China+India can be calculated by looking at years 2013 to 2017.