if global atmospheric warming is occurring so would global atmospheric pressure.
pv=nrt
volume could be assumed to be fixed by gravity and escape velocity .

if temperature increases then atmospheric pressure should be increasing on a directly proportionate basis .

could someone point to stats/data that confirms or explain why the data doesn't confirm this?

Yeah, Earth de facto is an open system. That is why, I think.

No, we don't need to take better care of the environment that sustains us, We NEED A COMPLETE OVERHAUL. The reasons for this are locked up in complex Physics and Statistical Thermodynamics so the solution has been hidden.

The Key to Australia's natural environmental wealth and carrying capacity is, believe it or not, our deserts. Deserts provide the heat engine (entropy) that drives coastal ecosystems.

Currently, all the heat from deserts is dissipated without any retention. We call this climate change. Retention of energy is needed to create constant ENTROPY gradients between Australia's centre and coastal areas.
Heat energy is best retained in internal areas in large, slow flowing bodies of water and in Wetlands. Most of Australia's wetlands have been bulldozed for farming and urban development so heat flows too quickly to coastal margins, taking all the moisture it can suck out of the soil. This phenomenon is clearly visible on TV weather maps. You frequently see throbbing Low pressure zones say off the coast of Sydney. These throbbing zones act like a thermodynamic heartbeat in pumping moisture from the low entropy centre of Australia to the open sea where it does no man or beast any good.

A network of 10,000 2 acre Engineered wetlands is required at strategic basins throuhghout the interior of Australia to retain moisture and all important sustainable Entropy gradients to coasts. This will cost about $5 billion but will save $3 billion in agriculture lost to drought each year. It will also significantly decrease bushfire events, another cost saving.

Additionally, an $800 million project for a solar desalination plant to pump water from Port Augusta to Lake Torrens and Lake Eyre would cool a significant area of South Australia such that important rain bearing winds from the Great Australian Bight will NOT be deflected towards the Tasman sea. The probability that moisture would be directed to inland SA Victoria and NSW becomes higher under a flooded Lake EYRE scenario.

michael, why is it then that nasa scientists are able to publish findings of global warming of pluto based on rising atmospheric pressure. surely pluto would be an open system too?

Let you check a Pluto's reality yourself, mate..................

Kaep's plan to cool the centre of Australia via large ponds is a really magical idea. And it is not the first time the suggestion has been raised for getting water permanently into Lake Eyre.
Kaep suggests putting fresh water into it. That adds an extra dimensin to a problem that is already tricky enough.
Let's just contemplate those earlier ideas: let the seawater trickle downhill into lake Eyre, as it is below sea level.
What sort of a channel would be needed, and how fast would the water have to run?
Lake Eyre (North Lake Eyre is 177kmX77km; Lake Eyre South, 64kmX24km)covers a substantial area - roughly 15,000 square kilometres. It is about 18 metres below sea level.
Average annual rainfall there is about 0.13 metres; evaporation 3.30 metres. That gives an average nett loss to evaporation on exposed water surfaces of 3.17 metres for Lake Eyre.
If the lakes are going to be kept full, there needs to be an annual input of (15,000X3.17) cubic kilometers of water.
It is a big project, so let's think big and dig a decent channel - say a kilometer wide. As there is only a drop of 18 metres, it is not much use having the channel more than 10 metres deep.
A kilometer length of such a channel would contain a packet of (1X1Xone hundredth)cubic kilometers of water; i,e., one hundredth.
To keep pace with evaporation, every year (15,000X3.17)X100 packets would have to pass aong the channel from the sea to Lake Eyre.
Each packet would have some 9 minutes in which to make the trip, which is about 400 kilometres.
Some two and a half thousand kilometres per hour is a bit fast for laminar flow in fluids - the turbulence could cause erosion in the channel.