@ClimateOpp@jdickerson@60Minutes [2/14] The Dutch, for obvious reasons, have been paying close attention to sea-level for a very long time. Their measurements show that there's been no significant acceleration in rate of sea-level rise in response to rising CO2 levels:
@ClimateOpp@jdickerson@60Minutes [3/14] Venice is one of the very few sites which have measured a statistically significant change in rate of sea-level rise: it DECELERATED slightly (probably because they curtailed groundwater pumping in the 1980s, to reduce subsidence).
@ClimateOpp@jdickerson@60Minutes [4/14] "The secular trend in MSL at venice during the twentieth century was a factor or two greater than at Trieste, which is almost certainly related to local anthropogenic effects including ground water pumping, see for example several publications by P.A.Pirazzoli." -PSMSL
@ClimateOpp@jdickerson@60Minutes [5/14] Trieste, Italy has a typical sea-level trend. As you can see, there's been no significant acceleration in the rate of sea-level rise.
@ClimateOpp@jdickerson@60Minutes [6/14] The "global" (i.e. average) sea-level trend is slightly up. But it's so slight that In many places it's dwarfed by local factors, like erosion, sedimentation, and vertical land motion. @GretaThunberg 's town is one such place. There the land rises >3x as fast as the ocean.
@ClimateOpp@jdickerson@60Minutes@GretaThunberg [7/14] The place recording sharpest acceleration is Brest, France. Even there it's nearly negligible, for practical purposes. The trend was 0.0 mm/yr in 1800s, but +1.5 mm/yr since 1900 (six inches/century), & no significant acceleration since 1900 (only 0.00483±0.01121 mm/yr²).
@ClimateOpp@jdickerson@60Minutes@GretaThunberg [9/14] Measuring sea-level is straightforward. It's been done accurately for >200 years, in some places.
It's not driven by AGW. CO2 levels have risen (rapidly) for 70 yrs. Temps have been rising (slowly) for 40 yrs. It has NOT measurably affected coastal sea-level trends.
@ClimateOpp@jdickerson@60Minutes@GretaThunberg [10/14] Wherever you look, the story is the same: regardless of whether the local sea-level trend is positive or negative, it hasn't accelerated significantly since the 1920s, or before.
@ClimateOpp@jdickerson@60Minutes@GretaThunberg [11/14] Local sea-level trends vary, due mostly to varying rates of local vertical land motion (subsidence or uplift). But they all show the same lack of significant acceleration in response to rising CO2 levels:
@ClimateOpp@jdickerson@60Minutes@GretaThunberg [12/14] Even at New York City's Battery Park, where land subsidence approximately doubles the rate of sea-level rise, there's been no significant acceleration in rate:
@ClimateOpp@jdickerson@60Minutes@GretaThunberg [13/14] Where there's no vertical land motion (subsidence or uplift), the trend looks about like this: perfectly linear for at least nine decades, with no detectable effect from rising CO2 levels:
You seem to have confused the source of the graphs with a paper that cited them. I don't know how you did that, since the source is shown right on each of the graphs.
1/10. Mouse wrote, "Increased CO2 does not increase the yield of maize or corn."
Wrong:
Even though I've seen it over and over, it still seems strange to me that climate activists just make things up like that. Surely you must realize that the benefits of elevated CO2 for corn/maize have been measured, right? So why do you do that??
3/10. Although C4 plants are better at scavenging CO2 from the air at low levels than are C3 plants, the most important C4 crops, corn & sugarcane, have been found to benefit dramatically from higher CO2 levels.
(That's probably because they grow so fast. On a still, sunny day, a healthy corn field can deplete the CO2 in the air by noon, at which point it stops growing. With a higher starting level, it can grow longer before running out of CO2.)
@ciais_philippe 2/7❯ The benefits of rising CO2 levels for agriculture are spectacular. CO2 is not the only reason for improving crop yields, but it is one of the major reasons:
@ciais_philippe 3/7❯ The best scientific evidence shows that CO2 emissions are beneficial, and manmade climate change is modest and benign. Here are some relevant studies: sealevel.info/negative_socia…